Why does nikon....

Started May 28, 2013 | Discussions thread
FooFighter007
New MemberPosts: 9
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Re: Maybe this will make more sense.
In reply to Richard, May 29, 2013

Even though camera lenses are more complex, after all this discussion no one bothers to post the equation for a simple lens:

1/f = 1/do + 1/di

f = focal length

do = object distance

di = image distance

This is why a 50mm lens is a 50mm lens no matter whether it's in front of a 35mm, APS-C, Super-16, etc film or digital sensor....In fact, it can be just in front of your face, that lens still has a 50mm focal length no matter how long you stare at it....;-)

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