What does "OS" mean on a Sigma lens?
19213
What do all those cryptic number and letter codes in a lens name mean?
67822
How to determine lens undistortion values for motion tracking?
71433
Python: What OS am I running on?
39613
What is standard for OS X filesystem? e.g. /opt/ vs. /usr/
81006
What model does Lightroom use for lens correction?
85191
Are manufacturers' Image Stabilisation ratings for zoom lenses deceptive?
71343
Is there a noticeable difference between 1.8 and 1.4 prime lenses?
10570
Does sensor size affect lens distortion?
55381
What is an ultra-wide lens?
131677
What does the 'macro' mode on my camera actually do?
44637
What are the constructional differences between a macro and a regular lens?
51050
What do the brackets around processes mean?
11996
How do I find the right size of filters for a lens?
154814
what is the distinction between /media, /mnt and /run/mount?
10440
What does STM mean on a Canon lens?
49187
What is focal length and how does it affect my photos?
102626
What do device type numbers mean?