Does an APS-C lens label itself with effective or true focal length?
75334
Why do Full Frame lenses and crop body lenses exhibit the same crop factor when used on a crop body camera?
41048
If I have a 18-55mm lens, is there a point in buying a 35mm prime lens?
85191
Are manufacturers' Image Stabilisation ratings for zoom lenses deceptive?
96529
How can I calculate magnification ratio I get by reversing a lens?
84007
Why are there no fast APS-C zooms beyond 55mm?
153578
Variable focal length for macro lenses?
39233
Would it be better to use a 35mm prime instead of a 50mm prime on a cropped sensor body?
9671
Do gravitational lenses have a focus point?
88406
What does different focal length offer me?
1032
What is the reference point that the focal length of a lens is calculated from?
101960
Why are crop lenses indicated with focal lengths they don't have?
150402
Is it normal for focal length to change while focusing?
129196
Does crop factor still apply to a vintage film SLR lens?
73874
Does the quality of a UV filter make a difference when used with a cheap lens?
109652
What is the limiting factor in lens construction when it comes to f-stop values?
59156
What lens is needed to change the minimal focus distance length of my camera?
10820
What is the formula for percent of frame filled at a specific distance and focal length?