Comparing focal length
11197
How do I convert lens focal length (mm) to x-times optical zoom?
135149
How do camera body motors compare to in-lens motors for focusing?
123499
How can I compare two captures to see which one is louder?
57844
What lens focal length most closely resembles the perspective of the human eye?
34665
What image-quality characteristics make a lens good or bad?
104610
What focal length lens do I need for photographing the moon?
45643
Detecting X or O in a small image
81660
Does autofocus work better with f/2.8 lenses vs f/4 or slower?
128590
Is the formula for object image size given focal length, etc. independent of sensor size?
139331
Why doesn't exposure change when changing focal length?
69119
Is the size of the entrance pupil the same as the size of the effective aperture?
146325
How is zoom measured?
17488
Why is FF sharper than crop body for the same framing of the same object?
138630
Can we measure size of an object using EXIF data from a photo?
96529
How can I calculate magnification ratio I get by reversing a lens?
71343
Is there a noticeable difference between 1.8 and 1.4 prime lenses?
60038
How do depth of field and the circle of confusion relate to pixel size on the sensor?