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DateField is a field that stores date, represented in Python by a datetime.date instance. As the name suggests, this field is used to store an object of date created in python. The default form widget for this field is a TextInput. The admin can add a JavaScript calendar and a shortcut for “Today” explicitly.

Syntax:

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DateField has the following extra optional arguments –

DateField.auto_now

  • Automatically set the field to now every time the object is saved. Useful for “last-modified” timestamps. Note that the current date is always used; it’s not just a default value that you can override.
    The field is only automatically updated when calling Model.save(). The field isn’t updated when making updates to other fields in other ways such as QuerySet.update(), though you can specify a custom value for the field in an update like that.

DateField.auto_now_add

  • Automatically set the field to now when the object is first created. Useful for creation of timestamps. Note that the current date is always used; it’s not just a default value that you can override. So even if you set a value for this field when creating the object, it will be ignored. If you want to be able to modify this field, set the following instead of auto_now_add=True:
    • For DateField: default=date.today – from datetime.date.today()
    • For DateTimeField: default=timezone.now – from django.utils.timezone.now()

    Note: The options auto_now_add, auto_now, and default are mutually exclusive. Any combination of these options will result in an error.

    Django Model DateField Explanation

    Illustration of DateField using an Example. Consider a project named geeksforgeeks having an app named geeks.

    Refer to the following articles to check how to create a project and an app in Django.

    • How to Create a Basic Project using MVT in Django?
    • How to Create an App in Django ?

    Deep learning neural network models used for predictive modeling may need to be updated.

    This may be because the data has changed since the model was developed and deployed, or it may be the case that additional labeled data has been made available since the model was developed and it is expected that the additional data will improve the performance of the model.

    It is important to experiment and evaluate with a range of different approaches when updating neural network models for new data, especially if model updating will be automated, such as on a periodic schedule.

    There are many ways to update neural network models, although the two main approaches involve either using the existing model as a starting point and retraining it, or leaving the existing model unchanged and combining the predictions from the existing model with a new model.

    In this tutorial, you will discover how to update deep learning neural network models in response to new data.

    After completing this tutorial, you will know:

    • Neural network models may need to be updated when the underlying data changes or when new labeled data is made available.
    • How to update trained neural network models with just new data or combinations of old and new data.
    • How to create an ensemble of existing and new models trained on just new data or combinations of old and new data.

    Let’s get started.

    How to date models

    How to Update Neural Network Models With More Data
    Photo by Judy Gallagher, some rights reserved.

    Tutorial Overview

    This tutorial is divided into three parts; they are:

    1. Updating Neural Network Models
    2. Retraining Update Strategies
      1. Update Model on New Data Only
      2. Update Model on Old and New Data
    3. Ensemble Update Strategies
      1. Ensemble Model With Model on New Data Only
      2. Ensemble Model With Model on Old and New Data

    Updating Neural Network Models

    Selecting and finalizing a deep learning neural network model for a predictive modeling project is just the beginning.

    You can then start using the model to make predictions on new data.

    One possible problem that you may encounter is that the nature of the prediction problem may change over time.

    You may notice this by the fact that the effectiveness of predictions may begin to decline over time. This may be because the assumptions made and captured in the model are changing or no longer hold.

    Generally, this is referred to as the problem of “concept drift” where the underlying probability distributions of variables and relationships between variables change over time, which can negatively impact the model built from the data.

    For more on concept drift, see the tutorial:

    Concept drift may affect your model at different times and depends specifically on the prediction problem you are solving and the model chosen to address it.

    It can be helpful to monitor the performance of a model over time and use a clear drop in model performance as a trigger to make a change to your model, such as re-training it on new data.

    Alternately, you may know that data in your domain changes frequently enough that a change to the model is required periodically, such as weekly, monthly, or annually.

    Finally, you may operate your model for a while and accumulate additional data with known outcomes that you wish to use to update your model, with the hopes of improving predictive performance.

    Importantly, you have a lot of flexibility when it comes to responding to a change to the problem or the availability of new data.

    For example, you can take the trained neural network model and update the model weights using the new data. Or we might want to leave the existing model untouched and combine its predictions with a new model fit on the newly available data.

    These approaches might represent two general themes in updating neural network models in response to new data, they are:

    • Retrain Update Strategies.
    • Ensemble Update Strategies.

    Let’s take a closer look at each in turn.

    Retraining Update Strategies

    A benefit of neural network models is that their weights can be updated at any time with continued training.

    When responding to changes in the underlying data or the availability of new data, there are a few different strategies to choose from when updating a neural network model, such as:

    • Continue training the model on the new data only.
    • Continue training the model on the old and new data.

    We might also imagine variations on the above strategies, such as using a sample of the new data or a sample of new and old data instead of all available data, as well as possible instance-based weightings on sampled data.

    We might also consider extensions of the model that freeze the layers of the existing model (e.g. so model weights cannot change during training), then add new layers with model weights that can change, grafting on extensions to the model to handle any change in the data. Perhaps this is a variation of the retraining and the ensemble approach in the next section, and we’ll leave it for now.

    Nevertheless, these are the two main strategies to consider.

    Let’s make these approaches concrete with a worked example.

    Update Model on New Data Only

    We can update the model on the new data only.

    One extreme version of this approach is to not use any new data and simply re-train the model on the old data. This might be the same as “do nothing” in response to the new data. At the other extreme, a model could be fit on the new data only, discarding the old data and old model.

    • Ignore new data, do nothing.
    • Update existing model on new data.
    • Fit new model on new data, discard old model and data.

    We will focus on the middle ground in this example, but it might be interesting to test all three approaches on your problem and see what works best.

    First, we can define a synthetic binary classification dataset and split it into half, then use one portion as “old data” and another portion as “new data.”

    Description of the illustration to_date.gif

    TO_DATE converts char of CHAR , VARCHAR2 , NCHAR , or NVARCHAR2 datatype to a value of DATE datatype. The fmt is a datetime model format specifying the format of char . If you omit fmt , then char must be in the default date format. If fmt is J , for Julian, then char must be an integer.

    This function does not convert data to any of the other datetime datatypes. For information on other datetime conversions, please refer to TO_TIMESTAMP, TO_TIMESTAMP_TZ, TO_DSINTERVAL, and TO_YMINTERVAL.

    The default date format is determined implicitly by the NLS_TERRITORY initialization parameter or can be set explicitly by the NLS_DATE_FORMAT parameter.

    The ‘nlsparam’ argument has the same purpose in this function as in the TO_CHAR function for date conversion.

    Do not use the TO_DATE function with a DATE value for the char argument. The first two digits of the returned DATE value can differ from the original char , depending on fmt or the default date format.

    This function does not support CLOB data directly. However, CLOB s can be passed in as arguments through implicit data conversion.

    The following example converts a character string into a date:

    The value returned reflects the default date format if the NLS_TERRITORY parameter is set to ‘ AMERICA ‘. Different NLS_TERRITORY values result in different default date formats:

    How to date models

    Carlos Delgado
    • August 27, 2017
    • 180.3K views

    Learn how to provide a custom format to a datetime object in Django.

    Working with dates in Django? The datetime module of Python offers classes for manipulating dates and times easily. You can format any date of Python (as long as it is a datetime object) using the strftime method.

    Date formatting

    A datetime object will have the method strftime that allows you to provide a custom format to a date and print it as a string wherever you need to. You can specify how and where every part of the date should be rendered with the following identifiers:

    Format string Description
    %a Locale’s abbreviated weekday name.
    %A Locale’s full weekday name.
    %b Locale’s abbreviated month name.
    %B Locale’s full month name.
    %c Locale’s appropriate date and time representation.
    %d Day of the month as a decimal number [01,31].
    %H Hour (24-hour clock) as a decimal number [00,23].
    %I Hour (12-hour clock) as a decimal number [01,12].
    %j Day of the year as a decimal number [001,366].
    %m Month as a decimal number [01,12].
    %M Minute as a decimal number [00,59].
    %p Locale’s equivalent of either AM or PM.
    %S Second as a decimal number [00,61].
    %U Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0.
    %w Weekday as a decimal number [0(Sunday),6].
    %W Week number of the year (Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0.
    %x Locale’s appropriate date representation.
    %X Locale’s appropriate time representation.
    %y Year without century as a decimal number [00,99].
    %Y Year with century as a decimal number.
    %Z Time zone name (no characters if no time zone exists).
    %% A literal ‘%’ character.

    In the View

    Within the controller, you have access directly to the datetime object. That means that you can simply execute the strftime function an pass the format string as first argument:

    In the Template

    If you are willing to format the string in the template and not in the view (controller), you can do it with a filter namely date. The following View (controller) returns a date object to a simple template that will print the date sent from the view:

    How to date models

    Does anyone need a good tool to quickly and easily create a diagram for a database schema? Does anyone need a good database diagram tool to quickly and easily create the different UML entity relationship diagram, SQL database diagram, ERD database diagram, ER database diagram in a software package? Edraw can be used to quickly create a wide rage of database diagrams: Chen-ERD diagram, Express-G diagram, data model diagram, Martin ERD, ORM diagram, data flow and process flow diagrams, ER Diagrams, UML diagrams, etc.
    This simple tutorial will illustrate how to draw a database model diagram with the professional edition of Edraw max.

    How to Draw a Database Model Diagram

    You can choose to use the Block Diagram and the Basic Drawing Shapes to draw your database model diagrams, but since there is a special template for Database Model diagram, we will look at that first. Open the Entity Relationship template and object relationship template from the ERD & Database category. For a quick start, on the Libraries menu, point to ERD & Database item, and then click Entity Relationship and Object Relationship item.

    How to date models

    Here is what your screen will look like at this point:

    Entity Relationship Template

    With the database model diagram template, you can create a new database model diagram by using either the relational or object relational modeling concepts. Use the Entity Relationship symbols to model databases. The entity relationship template includes entity, relationship, view, category and dynamic connector.

    How to date models

    Object Relationship Template

    Use the Object Relational shapes, which have additional shapes for working with types, to model databases. The object relationship template includes entity, relationship, type, table inheritance relationship, category to child relationship, view, category and dynamic connector.

    How to date models

    Then you can add shapes by either dragging shapes from the above two templates or using the drawing tools.

    How to date models

    The entity shape looks like an excel cell and you can resize it and edit every cell in it.

    Move or resize the green selection handle to resize a shape.

    Double click the shape to add text associated to a shape.

    To add independent test click the text tool icon – and click where on the diagram to place the text.

    When the entity shape is selected, you can use the Table context menu to add new row or column. Or spit and merge the cells.

    Create Relationship Between Entity Shapes

    Drag and drop the relationship connector to any blank space in the database model diagram. Notice that it appears as an arrow. You can modify the arrow style by line setting dialog. Drag one end of the connector tool from the connection point on the first shape to a connection point on the second shape. The connector endpoints turn red when the shapes are connected. This is an important visual cue. You can drag the green handles to try and reposition the connections to go in the desired direction.

    How to date models

    Database Model Diagram Example

    The following entity relationship diagram is showing a typical online or retail business ER database model diagram sample. The database model diagram consists of five tables and four parent-child relationships. Be sure you fully understand it.

    How to date models

    Share the Database Model Diagram

    When you complete the database model diagram, you can save it as the project file for revision later. You can print it or export it in the html, pdf, svg, transparent png format. You can also export it to MS Word, Excel or PowerPoint with one click.

    Challenge level: 3 out of 5

    Estimated reading time: 7 min

    Excel functions covered: SUM(), OFFSET() and MATCH()

    Excel attachment reference sheets: template_Excel

    BEFORE YOU START: Get your FREE Excel template that accompanies this five-part tutorial by subscribing here!

    \u2022 YTD and FYTD figures when \”latest month\” parameter changes.

    \u2022 Last year’s YTD and FYTD figures when \”latest month\” parameter changes.

    Get your free Excel template: http://bit.ly/FreeExcelTemplate5Day

    Read blog post: http://bit.ly/ExcelAutomateCalculation03

    “,”raw”:false>,”hSize”:null,”floatDir”:null,”html”:” \n “,”url”:”https://youtu.be/1t7Kb3R0HHg”,”width”:854,”height”:480,”providerName”:”YouTube”,”thumbnailUrl”:”https://i.ytimg.com/vi/1t7Kb3R0HHg/hqdefault.jpg”,”resolvedBy”:”youtube”>” data-block-type=”32″ >

    We can easily obtain YTD figures at this point by slightly tweaking the L12M formula.

    How to date models

    How to date models

    A slight tweak to the formula gives us FYTD figures in case your company follows a financial year different from the calendar year.

    How to date models

    How to date models

    To get YOY figures for YTD and FYTD, the best way to go about this is to calculate the previous year’s YTD and FYTD figures as well so that we can employ the simple mathematical equation of dividing the difference between current and previous years’ figures by the previous year figure.

    To get previous years’ YTD and FYTD figures, we need to only tweak the YTD and FYTD formulas so that they are referencing cells that contain Last Year date figures (i.e. column H instead of column G).

    YTD_last year example:

    How to date models

    We have finally covered all the formulas you need to know to build a template that gives you L12M, L12_Average, YTD, FYTD and YOY figures. More importantly, these formulas have been structured to automatically update these figures when there are time period changes.

    If you were secretly wishing for an easier way to to do this, you’re in luck! There is a more efficient way. We’ll be introducing you to it tomorrow, stay tune!

    This is the third article in a 5-part introduction tutorial that juxtaposes Excel formula with Power Query and Power Pivot. Here are the other parts if you missed them:

    How to Make Excel Add Months to Date

    In Excel Excel for Beginners This Excel for beginners guide teaches you everything you need to know about Excel spreadsheets and formulas to perform financial analysis. Watch the Video and learn everything a beginner needs to know from what is Excel, to why do we use, and what are the most important keyboard shortcuts, functions, and formulas , you can add a number of months to a date using the EDATE function. This can be very useful when performing financial modeling What is Financial Modeling Financial modeling is performed in Excel to forecast a company’s financial performance. Overview of what is financial modeling, how & why to build a model. and you are adjusting time periods. This is a step by step guide on how to have Excel Add Months to Date.

    For example, if you want to have a monthly financial model Types of Financial Models The most common types of financial models include: 3 statement model, DCF model, M&A model, LBO model, budget model. Discover the top 10 types , you can add one month to the start date. If you want a quarterly financial model, you can add 3 months to the start date.

    Formula: Excel Add Months to Date

    =EDATE(start date, number of months)

    (See screenshots and example below)

    Example of Adding Months to Date

    Follow the steps below to perform this procedure on your own:

    Step 1: Ensure the starting date is properly formatted – go to Format Cells (press Ctrl + 1) and make sure the number is set to Date.

    Step 2: Use the =EDATE(C3,C5) formula to add the number of specified months to the start date. Where cell C3 is equal to today’s date [the TODAY() function] and cell C5 is equal to the number 3.

    Step 3: Make sure the output cell is formatted as a Date, and not as a general number (press Ctrl +1 and select Date)

    Congratulations, you have now added months to a date in Excel!

    How to date models

    How to date models

    It’s as easy as that!

    More Excel Training

    Thank you for reading CFI’s step by step guide to learning how to add months in Excel. As mentioned above, this is a very common practice in financial modeling and a very useful formula for financial analysts. The best way to become a master at Excel is by practicing… a lot.

    To get more practice, check out these additional CFI self-study guides which will show you how to perform advanced functions and formulas:

    • Excel for Dummies Excel for Beginners This Excel for beginners guide teaches you everything you need to know about Excel spreadsheets and formulas to perform financial analysis. Watch the Video and learn everything a beginner needs to know from what is Excel, to why do we use, and what are the most important keyboard shortcuts, functions, and formulas
    • Index and Match Functions Index Match Formula Combining INDEX and MATCH functions is a more powerful lookup formula than VLOOKUP. Learn how to use INDEX MATCH in this Excel tutorial.
    • Excel Shortcuts List Excel Shortcuts PC Mac Excel Shortcuts – List of the most important & common MS Excel shortcuts for PC & Mac users, finance, accounting professions. Keyboard shortcuts speed up your modeling skills and save time. Learn editing, formatting, navigation, ribbon, paste special, data manipulation, formula and cell editing, and other shortucts
    • Important Excel Formulas Excel Formulas Cheat Sheet CFI’s Excel formulas cheat sheet will give you all the most important formulas to perform financial analysis and modeling in Excel spreadsheets. If you want to become a master of Excel financial analysis and an expert on building financial models then you’ve come to the right place.
    • Free Online Courses

    Free Excel Tutorial

    To master the art of Excel, check out CFI’s FREE Excel Crash Course, which teaches you how to become an Excel power user. Learn the most important formulas, functions, and shortcuts to become confident in your financial analysis.

    How to date models

    to take your career to the next level and move up the ladder!

    What is the DATE Function?

    The DATE Function in Excel is categorized under Excel Date/Time Functions Functions List of the most important Excel functions for financial analysts. This cheat sheet covers 100s of functions that are critical to know as an Excel analyst . It is the main function used to calculate dates in Excel. The DATE function is very useful for financial analysts Financial Analyst Job Description The financial analyst job description below gives a typical example of all the skills, education, and experience required to be hired for an analyst job at a bank, institution, or corporation. Perform financial forecasting, reporting, and operational metrics tracking, analyze financial data, create financial models because financial modeling What is Financial Modeling Financial modeling is performed in Excel to forecast a company’s financial performance. Overview of what is financial modeling, how & why to build a model. requires specific time periods. For example, an analyst can use the DATE function in Excel in their financial model to dynamically link the year, month, and day from different cells into one function.

    The DATE function is also useful when providing dates as inputs for other functions such as SUMIFS or COUNTIFS since you can easily assemble a date using year, month, and day values that come from a cell reference or formula result.

    Formula

    =DATE(year,month,day)

    The DATE function includes the following arguments:

    1. Year – This is a required argument. The value of the year argument can include one to four digits. Excel interprets the year argument according to the date system used by the local computer. By default, Microsoft Excel for Windows uses the 1900 date system, which means the first date is January 1, 1900.
    2. Month – This is a required argument. It can be a positive or negative integer representing the month of the year from 1 to 12 (January to December).
    • Excel will add the number of months to the first month of the specified year. For example, DATE(2017,14,2) returns the serial number representing February 2, 2018.
    • When the month is less than or equal to zero, Excel will subtract the absolute value of month plus 1 from the first month of the specified year.

    For example, DATE(2016,-3,2) returns the serial number representing September 2, 2015.

    1. Day – This is a required argument. It can be a positive or negative integer representing the day of a month from 1 to 31.
    • When day is greater than the number of days in the specified month, day adds that number of days to the first day of the month. For example, DATE(2016,1,35) returns the serial number representing February 4, 2016.
    • When day is less than 1, this function will subtract the value of the number of days, plus one, from the first day of the month specified. For example, DATE(2016,1,-15) returns the serial number representing December 16, 2015.

    How to use the DATE Function in Excel?

    The Date function is a built-in function that can be used as a worksheet function in Excel. To understand the uses of this function, let’s consider a few examples:

    Example 1

    Let’s see how this function works using the different examples below:

    Formula used Result Remarks
    DATE(YEAR(TODAY()), MONTH(TODAY()), 1) January 11, 2017 Returns the first day of the current year and month
    DATE(2017, 5, 20)-15 May 5, 2017 Subtracts 15 days from May 20, 2017

    Example 2

    Suppose we need to calculate the percentage remaining in a year based on a given date. We can do so with a formula based on the YEARFRAC function.

    How to date models

    The formula to be used is:

    How to date models

    We get the result below:

    How to date models

    A few things to remember about the DATE function

    1. #NUM! error – Occurs when the given year argument is Click here to download the sample Excel file

    Additional resources

    Thanks for reading CFI’s guide to important Excel functions! By taking the time to learn and master these functions, you’ll significantly speed up your financial analysis. To learn more, check out these additional CFI resources:

    • Excel Functions for Finance Excel for Finance This Excel for Finance guide will teach the top 10 formulas and functions you must know to be a great financial analyst in Excel.
    • Advanced Excel Formulas Course
    • Advanced Excel Formulas You Must Know Advanced Excel Formulas Must Know These advanced Excel formulas are critical to know and will take your financial analysis skills to the next level. Download our free Excel ebook!
    • Excel Shortcuts for PC and Mac Excel Shortcuts PC Mac Excel Shortcuts – List of the most important & common MS Excel shortcuts for PC & Mac users, finance, accounting professions. Keyboard shortcuts speed up your modeling skills and save time. Learn editing, formatting, navigation, ribbon, paste special, data manipulation, formula and cell editing, and other shortucts

    Free Excel Tutorial

    To master the art of Excel, check out CFI’s FREE Excel Crash Course, which teaches you how to become an Excel power user. Learn the most important formulas, functions, and shortcuts to become confident in your financial analysis.

    How to date models

    to take your career to the next level and move up the ladder!

    When you want to find a way to do something on your Samsung TV, it’s essential to know the model and generation of your TV. However, if you’re not very tech-savvy, this can be easier said than done. That’s why we’re going to show you how to do just that.

    How to date models

    As you’ll see, the model number can reveal much more than the production year (or years) of your TV. For example, you’ll also find out the screen size in inches and perhaps the region for which your Samsung TV was made.

    How to Find the Model Number of Your Samsung TV?

    It depends on the model of the TV. Since you’re not sure of the model itself, here are three ways to check for it.

    1. Look on the right side of your Samsung TV – Many models have the serial number and the model code written on them. This is the most common location for these numbers.
    2. Look at the back of your Samsung TV – If the number isn’t on the right side, it could be at the back of your TV, especially if you have an older model. Samsung used to attach the serial numbers at the back of its devices, but since then the manufacturer must have realized that it’s more practical to stick it somewhere more visible.
    3. Contact customer support – Whether accidentally or purposefully, Samsung omitted the inclusion of the serial number and the model code on some of its latest smart TVs. If you can’t find it, turn on your TV, open the Menu, select Support, select Contact Samsung, and follow the instructions.

    How to date models

    Understanding Model Numbers Before 2017

    Hopefully, you’ve found out your model number. You might have been surprised to learn that it’s more than 10 characters long. Don’t worry, as they make perfect sense as each of them contains an essential piece of information.

    There’s a slight difference in the numbering models of before and after 2017. Even if you’re certain that your TV is year 2017 or later, you’ll want to read the rest of this section before moving on to the next. (The first 10 characters of the model number still carry the same info.)

    Every Samsung TV model number starts with the letter U, which indicates the type of device, i.e. U for televisions. The second letter indicates the region for which your TV is made: E for Europe, N for the Americas, and A for Australia and Africa. The number after that is your screen size in inches.

    Finally, the next letter is what interests you the most – the year when your Samsung TV was manufactured. Here are the possibilities:

    1. A – 2008 model
    2. B – 2009
    3. C – 2010
    4. D – 2011
    5. E – 2012
    6. F – 2013
    7. H – 2014
    8. J – 2015
    9. K – 2016

    After this, there’s a letter that indicates the resolution screen matrix, and then there’s a number that indicates the series. The second number indicates whether your model is the first, second, and so on in a particular series. The last part of the code refers to the type of the digital tuner built-in.

    Understanding Model Numbers After 2017

    In 2017 on out, Samsung has been installing full sets of tuners in its TVs according to the standards used in the country for which the TVs are made. That’s why the model numbers also became even longer, where the last two letters indicate the country.

    ZA, for example, indicates that the TV was assembled for the US market, ZC for Canada, XU for the UK, and XY for Australia. This is great because your TV now comes with the right tuner for your country.

    Everything else is pretty similar to the model numbers before 2017 (see above). All except the production year code, of course. Building on the A to K from above (2008-2016), you have:

    1. M – 2017 model
    2. N – 2018
    3. R – 2019
    4. T – 2020

    What About QLED Samsung TVs?

    In 2019, Samsung changed how it assigns serial numbers to QLED TVs. All QLED serial numbers now start with the prefix Q, before the letter that indicates the region. After that, there’s the screen size in inches, followed by another Q for Quantum Dot TV. This is followed by the series number, which at the moment is limited to either 90 for UHD or 900 for 8K.

    The year of production follows, in which case there are only two – R for 2019 models and T for 2020 models. Another difference is that the serial numbers of QLED TVs also contain a generation indicator right after the year:

    1. A – first-generation
    2. B – second-generation
    3. S – super TV with additional features
    4. G – TV made for Germany

    How to date models

    Decoding Can Be Fun!

    We hope that you managed to find out the model and year of your Samsung TV and perhaps more importantly, had fun while you were at it.

    Did it surprise that all of these details are apparent from the model number of your TV? Feel free to share your thoughts about anything in the comments section below!

    Rolleiflex TLR models with Fixed Focusing Hood

    Rollei TLR Model Serial Numbers Bay size Introduced
    Rolleiflex 3.5 X Synch 1100000-1169999 I 1950
    Rolleiflex 3.5 M-X Synch 1200000-1427999 I 1951
    Rolleiflex 3.5 M-X E-V 1428000-1499999 I 1954
    Rolleiflex 3.5 M-X E-V 1700000-1737911 I 1954
    Rolleiflex 3.5E Exp. Meter 1740000-1869000 II 1956
    Rolleiflex 2.8A 2.8 Tessar X – MX 1101000-1204999 Spec Hood – II 1950
    Rolleiflex 2.8B 2.8 Biometer 1204000-1260000 III 1951
    Rolleiflex 2.8C 2.8 Xenotar 1260350-1444000 III 1953
    Rolleiflex 2.8C 2.8 Planar 1444001-1475405 III 1953
    Rolleiflex 2.8D E-V Scale 1600000-1620999 III 1955
    Rolleiflex 2.8E Exp. Meter 1621000-1665999 III 1956
    Rolleicord III X SYNCH 1137000-1344051 I 1950
    Rolleicord IV M-X Synch 1344051-1390999 I 1953
    Rolleicord V M-X – E-V Scale 1500000-1583999 I 1955
    Rolleicord Va 5-format 1584000-1599999 I 1957
    Rolleicord Va 5-format 1900000-1943999 I 1957
    Rolleiflex 4X4 127 film 2000000-2099999 I 1957

    Rolleiflex TLR models with Removable Focusing Hood