What is the purpose of wide lenses?
11051
Is there a difference between taking a far shot on a 50mm lens and a close shot on a 35mm lens?
1032
What is the reference point that the focal length of a lens is calculated from?
91202
Why is the aperture ring removed from new Nikon lenses?
57920
Does it make sense to put an expensive lens on a cheap camera?
158181
How does the lens diameter influence photo quality?
18161
How would one use filters with the "bulb"-like shape front element lenses?
145622
How do constant aperture zoom lenses work?
20439
Do lenses have focal planes or focal spheres/ellipsoids?
17851
How does using a lens with some focal length on a full frame camera differ from using a lens with "equivalent" focal lens on a crop camera?
101736
What is the difference between Canon "L" lenses and non-L lenses?
26351
What macro techniques offer an alternative to expensive optics?
105343
Interference at the focus of a convex lens or a concave mirror
138978
Is optical image stabilization a necessary feature for any lens?
41934
How do zoom, magnification, and focal length relate?
62822
How can lens cause consistent front or back focus?
9671
Do gravitational lenses have a focus point?
62759
Why am I allowed to turn my focusing ring beyond infinity?