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F = 35mm means the focal length of the lens is 35 millimeters. The focal length is the distance from the place where light enters the lens through to where the light rays converge in a point.

For most people, the number (35mm) simply indicates the size of the lens and what type of images you can expect to get with it. For example, in a 35mm SLR camera, the "normal lens" is 50mm. "Normal" simply means when you look through the viewfinder* the lens makes the perspective you see look natural. Nothing appears closer or farther away; nothing appears distorted.

Lenses with a focal length shorter than 50mm (35 mm, 20mm, etc.) are called "wide angle" lenses, because they allow the film (or sensor**) to record a wider angle of view than the normal lens. Lenses with a focal length longer than 50mm are called telephoto lenses (110 mm, 200 mm, etc), because they allow the film/sensor to record more of a close-up view.

This is an oversimplified explanation, but should give you a general idea of what f = 35 indicates.

* Assuming you're not looking through a rangefinder.

** Digital sensors that are less than full frame use a multiplier that varies based on sensor size (e.g., 1.5, 1.6), so a 35 mm focal length will give different results when used on a digital camera. This is just a note -- we'll save the full explanation for another question.

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