Do lenses with the same f-stop but different focal length gather the same amount of light?
53448
Do bigger focal lengths capture more light?
15644
What is crop factor and how does it relate to focal length?
135149
How do camera body motors compare to in-lens motors for focusing?
52967
Can screw-on macro lenses produce decent results?
63434
Technically, why is the out of focus area blurred more when using a bigger aperture?
145622
How do constant aperture zoom lenses work?
94456
Why does my one lens have different exposure (t-stop) than my other lens?
41934
How do zoom, magnification, and focal length relate?
34665
What image-quality characteristics make a lens good or bad?
29080
How do extension tubes affect focusing distance?
158181
How does the lens diameter influence photo quality?
38712
Diffraction by a lens
71754
Why do two zoom lenses set to 200mm on the same camera produce different fields of view?
128590
Is the formula for object image size given focal length, etc. independent of sensor size?
97118
Difference Between Fraunhofer and Fresnel Diffraction
10570
Does sensor size affect lens distortion?
105343
Interference at the focus of a convex lens or a concave mirror