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What does mm specify in a lens?

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Anonymous

17y ago
Updated: 8/16/2019

you will see the mm used twice on most lenses. One is just the diameter of the front element/filter size.

the important one is the focal length. which impacts the field of view and reach of the lens. In film camera equivalents under 40 mm is the wide to ultra wid FoV , 40-60 is the range considered "normal" meaning it approximates what we see with our eyes, 60 and up are telephoto which have a narrower FoV and magnify giving closer view of distant scenes.

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Wiki User

17y ago

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