How do fixed lenses "focus" on things at different distances?
4389
How can a lens with a single focal length focus on more than one plane?
139331
Why doesn't exposure change when changing focal length?
33211
How do I diagnose the source of focus problem in a camera?
116792
Is there a single lens suited for flying birds, mountains, and close-up portraits?
104837
How to create real tilt-shift lens blur in Blender?
67822
How to determine lens undistortion values for motion tracking?
58074
Physics of Focusing a Laser
20439
Do lenses have focal planes or focal spheres/ellipsoids?
48375
How do I calibrate the diopter correction on my DSLR's viewfinder?
29080
How do extension tubes affect focusing distance?
15724
Graviational Lensing Data
47703
How can i apply lens effect to my UIImage?
128954
How can we see objects that are so far away?
59156
What lens is needed to change the minimal focus distance length of my camera?
48715
Photographic techniques to avoid chromatic aberration?
41934
How do zoom, magnification, and focal length relate?
113163
Why do some lenses focus past infinity?