How does "designed for APS-C" affect focal length?
51290
Does my crop sensor camera actually turn my lenses into a longer focal length?
107818
What is the shape of the focal plane?
5740
What is a good wide-angle prime lens for Nikon DX (APS-C) format?
53448
Do bigger focal lengths capture more light?
150402
Is it normal for focal length to change while focusing?
97916
Can the EF lenses of a Canon EOS film camera be used on an APS-C digital EOS camera?
21744
Focal length of an ellipse and related results
11096
Why does my aperture setting change as I zoom on my DSLR kit lens?
71754
Why do two zoom lenses set to 200mm on the same camera produce different fields of view?
1797
Do ND filters increase the dynamic range that a camera can 'see'?
30241
How do different aperture and shutter settings affect a photo with the same overall exposure?
40865
What should I do when I have lenses with different filter thread sizes?
10820
What is the formula for percent of frame filled at a specific distance and focal length?
139331
Why doesn't exposure change when changing focal length?
75334
Why do Full Frame lenses and crop body lenses exhibit the same crop factor when used on a crop body camera?
5000
Do smaller apertures provide more depth of field past the diffraction limit, even if peak sharpness suffers?
101960
Why are crop lenses indicated with focal lengths they don't have?