Actual Focal Length on APS-C cameras
51290
Does my crop sensor camera actually turn my lenses into a longer focal length?
85095
Selecting optical size?
13266
How much light and resolution is lost to color filter arrays?
26420
Possible to lock focal length on zoom lens? (SELP1650)
83556
What are the theoretical minimum and maximum apertures?
146325
How is zoom measured?
27512
Real Size Image Printing
16732
How to get exact camera view?
11197
How do I convert lens focal length (mm) to x-times optical zoom?
104812
What differences exist between third-party and official lenses for Canon APS-C DSLRs?
7664
Why are effective pixels greater than the actual resolution?
80219
What is the relationship between field of view and focal length for fisheye?
10570
Does sensor size affect lens distortion?
58821
How can the aperture value written in Exif be larger than the nominal limit of the lens?
17851
How does using a lens with some focal length on a full frame camera differ from using a lens with "equivalent" focal lens on a crop camera?
8552
Which focal-length lens is usually used for portrait photography, and why?
129613
Why does illuminance stay the same for a given f-stop even when focal length changes?