What does it mean when 'HD' is printed on a lens?
19213
What do all those cryptic number and letter codes in a lens name mean?
101960
Why are crop lenses indicated with focal lengths they don't have?
20086
Why is the amount of light a lens lets in called the 'lens speed'?
71172
Why is there quality loss on my image styles?
34665
What image-quality characteristics make a lens good or bad?
20439
Do lenses have focal planes or focal spheres/ellipsoids?
116077
What exactly is 70mm print and why does anyone care?
144558
Lens with small scratches on the front element - how do they affect IQ?
46343
When changing between manual and auto focus, should I change the setting on both the body and the lens?
48382
What does this triangle/diamond schematic symbol represent?
47999
How do you find out the "sweet spot" of a lens?
49671
Why are there unwanted white lines appearing in a PDF print proof?
29107
Will increasing the dpi of my image (without re-sampling) hurt print quality?
63287
What is meant by pixels and DPI for photo submissions?
21523
How can aperture be f/11 on a lens with an aperture range designation of 3.5-5.6?
80031
What is the difference between "photo" and "image"?
51467
What does the $\prod$ symbol mean?