Focal length measurement and definition in DSLR cameras
1032
What is the reference point that the focal length of a lens is calculated from?
34009
How do I calculate the number of stops between two shutter speeds?
104610
What focal length lens do I need for photographing the moon?
148416
What do the different Canon DSLR image size settings mean?
134974
What is the focal length on your typical cell phone camera?
70481
Relationship between the the slit width $w$ and source distance $d$
34583
How can I calculate sensor size (width and height) from focus length, vertical, and horizontal angle of view?
65660
How to calculate the signal-to-noise ratio (SNR) in an image?
60038
How do depth of field and the circle of confusion relate to pixel size on the sensor?
107818
What is the shape of the focal plane?
26420
Possible to lock focal length on zoom lens? (SELP1650)
90109
Are cropped images from a full-frame sensor equal quality to full APS-C images despite the lower resolution?
6949
Image processing with Android Camera
53448
Do bigger focal lengths capture more light?
7127
Overview of basic results about images and preimages
42940
How do I calculate the distance of an object in a photo?
34665
What image-quality characteristics make a lens good or bad?