In the most basic sense, a cropped sensor is usually cropped 1.5-1.6x in from the size of a full frame sensor, so an 18mm lens on a full frame sensor becomes a 27-28mm lens.

In a function, ARGN, ARGC, ARGV and ARGV0, ARGV1, ... are true variables in the usual CMake sense. In a macro, they are not, they are string replacements much like the C preprocessor would do with a macro. This has a number of consequences, as explained in the Argument Caveats section below.

Furthermore, ${ARGV} holds the list of all arguments given to the macro and ${ARGN} holds the list of arguments past the last expected argument. Referencing to ${ARGV#} arguments beyond ${ARGC} have undefined behavior. Checking that ${ARGC} is greater than # is the only way to ensure that ${ARGV#} was passed to the function as an extra argument.

Note that if you have a variable with the same name in the scope from which the macro is called, using unreferenced names will use the existing variable instead of the arguments. For example:

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As a basic rule of thumb, most landscape images are shot on a wide angle lens, as this allows you fit the most of the scene in.

In the first case, you can use if(${ARGV1}). In the second and third case, the proper way to check if an optional variable was passed to the macro is to use if(${ARGC} GREATER 2). In the last case, you can use foreach(loop_var ${ARGN}) but this will skip empty arguments. If you need to include them, you can use

Focal length of lens formula

The focal length is usually stated on the side of your camera lens. If you got a lens bundled in with your camera, it’s probably going to be something like an 18-55mm or a 24-105mm.

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Defines a macro named that takes arguments named , ... Commands listed after macro, but before the matching endmacro(), are not executed until the macro is invoked.

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Will loop over a;b;c and not over x;y;z as one might have expected. If you want true CMake variables and/or better CMake scope control you should look at the function command.

Per legacy, the endmacro() command admits an optional argument. If used, it must be a verbatim repeat of the argument of the opening macro command.

Unlike a function, the CMAKE_CURRENT_FUNCTION, CMAKE_CURRENT_FUNCTION_LIST_DIR, CMAKE_CURRENT_FUNCTION_LIST_FILE, CMAKE_CURRENT_FUNCTION_LIST_LINE variables are not set for a macro.

Now, this can get complicated again, depending on which sensor your camera has, often referred to as full frame or cropped sensor.

When you move into taking portraits of people, they tend to be around 50mm as this replicates most the view of the human eye. If you’re into shooting sports photography or wildlife, you’ll be looking at getting what’s called a telephoto lens, which will be closer to 200mm or even longer.

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The shorter your focal length, the wider your angle of view will be – so an 18mm lens will give you a wider image than the same lens zoomed to 55mm.

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In addition to referencing the formal parameters you can reference the values ${ARGC} which will be set to the number of arguments passed into the macro as well as ${ARGV0}, ${ARGV1}, ${ARGV2}, ... which will have the actual values of the arguments passed in. This facilitates creating macros with optional arguments.

Camera lens distance chart

GOOD POST to understand about the basic role focal length in camera. Thanks for sharing this short and concise post. This would help beginners to get a right information.

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F-Mount Lens/DX Format · 52.5mm (35mm Equivalent) · Aperture Range: f/1.8 to f/22 · One Aspherical Element.

If you’re starting out, don’t get too hung up on feeling the need to get a full frame camera. There are plenty of great lenses made for cropped sensor cameras which will give you a wider field of view.

Another difference between macros and functions is the control flow. A function is executed by transferring control from the calling statement to the function body. A macro is executed as if the macro body were pasted in place of the calling statement. This has the consequence that a return() in a macro body does not just terminate execution of the macro; rather, control is returned from the scope of the macro call. To avoid confusion, it is recommended to avoid return() in macros altogether.

When a macro is invoked, the commands recorded in the macro are first modified by replacing formal parameters (${arg1}, ...) with the arguments passed, and then invoked as normal commands.

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That’s it for today’s Creative Christmas, check back in tomorrow to learn a little bit about shutter speed and how it affects your images – and remember, if you want these video tips delivered directly to your inbox each day then you can either subscribe to our Youtube channel or sign up to the blog to get all the newest content here and we’ll handle the rest.

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and so on. However, it is strongly recommended to stay with the case chosen in the macro definition. Typically macros use all-lowercase names.

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Today, we’re going to cover the first of our basic skills which is lens choice and what does “focal length” mean in photography.