What F means in lenses and how to find focus distance
135245
What does f-stop mean?
44285
What does this notation mean? F|U
44637
What are the constructional differences between a macro and a regular lens?
14182
How to ensure sharp focus when shooting with an open aperture?
63434
Technically, why is the out of focus area blurred more when using a bigger aperture?
109692
How does a spherical lens differ from an aspherical lens?
114778
What is the difference between DX format and FX format lenses, and which to choose for what purpose?
57844
What lens focal length most closely resembles the perspective of the human eye?
11625
Canon 50mm f1.4 no longer focuses reliably
21523
How can aperture be f/11 on a lens with an aperture range designation of 3.5-5.6?
37632
How to compare the focal length of a 50mm prime lens with the default lens of a point and shoot camera?
35335
What is the relationship between focal length and shutter speed?
145622
How do constant aperture zoom lenses work?
17968
Does 4.0-72mm on the lens when equivalent focal length is 24-432mm mean crop factor of 6×?
87632
How do I find the thread diameter of my lens?
34583
How can I calculate sensor size (width and height) from focus length, vertical, and horizontal angle of view?
42940
How do I calculate the distance of an object in a photo?