How to read lens specs
19213
What do all those cryptic number and letter codes in a lens name mean?
113163
Why do some lenses focus past infinity?
85095
Selecting optical size?
83556
What are the theoretical minimum and maximum apertures?
55381
What is an ultra-wide lens?
151884
How do I set focus range?
145204
Calculate object size when I have physical pixel size
47371
How to calculate the scale of current Zoom Level with parameters like extent, resolution?
26420
Possible to lock focal length on zoom lens? (SELP1650)
87931
Sign convention for mirror and lens formulas
34665
What image-quality characteristics make a lens good or bad?
98410
How to shop for a lens filter?
158181
How does the lens diameter influence photo quality?
60690
Optical microscope magnification limits?
128590
Is the formula for object image size given focal length, etc. independent of sensor size?
21744
Focal length of an ellipse and related results
94098
How can I find infinity focus on a kit lens with no markers?