Is it like an 18-55 DX lens on a DX body effectively equivalent to 27-82?
75334
Why do Full Frame lenses and crop body lenses exhibit the same crop factor when used on a crop body camera?
83556
What are the theoretical minimum and maximum apertures?
152115
Can I convert binocular zoom to equivalent lens focal length?
26351
What macro techniques offer an alternative to expensive optics?
116068
How to determine exact contrast ratio
53448
Do bigger focal lengths capture more light?
142585
Is there a theoretical maximum for refractive index?
86838
What do the red values mean on the distance scale of a lens?
1032
What is the reference point that the focal length of a lens is calculated from?
95190
What should I look for in lenses for long range and close up animal and natural shots?
3867
is it normal to get significant lens flare with a 50mm f/1.8 prime lens?
2224
What's the difference between using a 50mm f/1.8G and a 50mm f/1.8D with a Nikon D80?
69119
Is the size of the entrance pupil the same as the size of the effective aperture?
11197
How do I convert lens focal length (mm) to x-times optical zoom?
130932
Effective Refractive Index
131157
Should I replace the Canon 18-55mm f/3.5-5.6 kit lens with a 40mm f/2.8 or 50mm f/1.4?
9259
How compatible are my old Nikon lenses?