Why are lower focal length lenses wider?
11001
What is "angle of view" in photography?
94456
Why does my one lens have different exposure (t-stop) than my other lens?
20168
Wide Angle Lens on a Step Down ring?
103113
Why do zoom lenses and compact cameras have varied maximum aperture across the zoom range?
42808
Simply bad focus or too big aperture?
11996
How do I find the right size of filters for a lens?
17851
How does using a lens with some focal length on a full frame camera differ from using a lens with "equivalent" focal lens on a crop camera?
150402
Is it normal for focal length to change while focusing?
75334
Why do Full Frame lenses and crop body lenses exhibit the same crop factor when used on a crop body camera?
55381
What is an ultra-wide lens?
4389
How can a lens with a single focal length focus on more than one plane?
71754
Why do two zoom lenses set to 200mm on the same camera produce different fields of view?
17968
Does 4.0-72mm on the lens when equivalent focal length is 24-432mm mean crop factor of 6×?
37632
How to compare the focal length of a 50mm prime lens with the default lens of a point and shoot camera?
59156
What lens is needed to change the minimal focus distance length of my camera?
8552
Which focal-length lens is usually used for portrait photography, and why?
113163
Why do some lenses focus past infinity?