Why is there no lens that is perfect for any situation?
12994
Is it physically possible to build a long zoom (17-300 mm for example) at an aperture value of around 1.4 or 1.2?
4389
How can a lens with a single focal length focus on more than one plane?
114324
Is there any protection ring available for reversed lenses?
20439
Do lenses have focal planes or focal spheres/ellipsoids?
34665
What image-quality characteristics make a lens good or bad?
95801
Medium with refractive index less than unity?
43047
Why do some lenses cost 10 times as much when the specs are very close?
75334
Why do Full Frame lenses and crop body lenses exhibit the same crop factor when used on a crop body camera?
98701
If a lens focuses all incoming light to a point, how do we get 2D images?
46184
What should I consider when purchasing a macro lens?
52326
Why does a ray passing through optical centre remain undeviated?
132064
Do I need a slim or normal polarized filter for a wide angle lens?
47999
How do you find out the "sweet spot" of a lens?
101960
Why are crop lenses indicated with focal lengths they don't have?
138067
Why are 50mm Lenses Cheaper?
101300
What to look for in a wide angle lens?
85191
Are manufacturers' Image Stabilisation ratings for zoom lenses deceptive?