Optical focal length
59156
What lens is needed to change the minimal focus distance length of my camera?
11996
How do I find the right size of filters for a lens?
63434
Technically, why is the out of focus area blurred more when using a bigger aperture?
15724
Graviational Lensing Data
126293
Relationship between slit size and wavelength in diffraction
93222
How does sensor size affect the brightness of an image given the same field of view and aperture?
80219
What is the relationship between field of view and focal length for fisheye?
20086
Why is the amount of light a lens lets in called the 'lens speed'?
130201
Imaginary number for extinction coefficient in complex refractive index
112426
Transmittance of glass
10570
Does sensor size affect lens distortion?
86838
What do the red values mean on the distance scale of a lens?
16777
Is there a limit to the resolving power of a mirror telescope?
85095
Selecting optical size?
37422
Since it's not "focal length", what is the term for the distance at which things are in focus?
52326
Why does a ray passing through optical centre remain undeviated?
57844
What lens focal length most closely resembles the perspective of the human eye?