What does the red R in old manual lenses mean?
86838
What do the red values mean on the distance scale of a lens?
6402
What does negative R-squared mean?
101960
Why are crop lenses indicated with focal lengths they don't have?
19213
What do all those cryptic number and letter codes in a lens name mean?
145622
How do constant aperture zoom lenses work?
144828
Is the standard Canon 18-55 lens the same as 5 years ago?
104811
Green light on red article
21523
How can aperture be f/11 on a lens with an aperture range designation of 3.5-5.6?
32282
Why I am getting different $R^2$ from R LM and manual calculation?
94271
What is the reference plane used when the minimum focus distance is measured?
11097
Can I use old Minolta AF lenses on my new Canon?
33875
What are the biggest differences between Reversal Rings, Extension Tubes and Macro Lenses?
58265
What happens to a lens when you turn the focus ring during AF mode?
13803
Does the selection of sRGB or Adobe RGB in camera when shooting RAW ever matter?
96529
How can I calculate magnification ratio I get by reversing a lens?
113163
Why do some lenses focus past infinity?
80891
What do the .eh_frame and .eh_frame_hdr sections store, exactly?