Why 1 sunbeam for each aperture blade in your lens?
90676
Why do light sources appear as stars sometimes?
5457
Why do shadows from the sun join each other when near enough?
78111
Should I use the rubber viewfinder cover?
98701
If a lens focuses all incoming light to a point, how do we get 2D images?
101960
Why are crop lenses indicated with focal lengths they don't have?
62759
Why am I allowed to turn my focusing ring beyond infinity?
136611
Why choose an 80-200mm over an 18-200mm lens?
124074
Does stacking more lens filters decrease overall image quality?
9033
What is aperture, and how does it affect my photographs?
34475
Spherical mirror ray diagram question
6544
How do zoom lenses restrict their widest aperture at the telephoto end?
104041
What does a lens hood do?
85837
What's the difference between real and effective aperture?
61989
How can I intentionally include lens flare in my photographs?
52368
Does the diameter of the aperture increase with increases in the focal length with constant F-number(F-stops)?
140107
What temperature is achieved in focus point by 5000 flat 1x1cm mirrors onto a satellite dish?
40865
What should I do when I have lenses with different filter thread sizes?