What's with these petal-shaped lens hoods?
60859
Why are some lens hoods petal shaped and others not?
57449
TikZ: How to make a convex lens
101960
Why are crop lenses indicated with focal lengths they don't have?
136978
Help Identifying Weird Component
15724
Graviational Lensing Data
33875
What are the biggest differences between Reversal Rings, Extension Tubes and Macro Lenses?
78324
What causes the shadow at the bottom of this photograph?
61006
Can a lens shader be made in cycles
78637
What are these pins?
105373
Why is this glass Cycles material casting solid shadows?
19213
What do all those cryptic number and letter codes in a lens name mean?
64637
Irregularly shaped forms
112594
What is this "colour template/effect"?
44637
What are the constructional differences between a macro and a regular lens?
21637
How does one use circular polarizers?
54818
Why does fungus form in lenses, and how to get rid of it?
142400
Why in a photo light lines of street lamps? How to remove them?