All Questions
9
questions
19
votes
5
answers
3k
views
What are the benefits of the classic f-number scheme?
Classic ƒ numbers are entrance pupil diameter as a fraction of focal length. This seems like a slightly strange choice as exposure is proportional to area rather than diameter. Naively I would think ...
- 416
2
votes
4
answers
24k
views
What does 1:4-5.6 mean on a lens?
what does 1:4-5.6 means on the lens. Does it means that the focal length is from f4 to f5.6 only? Or does it means that it has a range from f1 to f5.6?
- 21
2
votes
3
answers
3k
views
What does "maximum aperture" mean in a camera spec? Where can I get the full aperture range?
I own a Canon S95, and am considering getting a newer model (e.g. Canon S110 or S120), and I'm comparing the specs. According to DPReview.com, the S95 has a maximum aperture of F2.0-F4.9, and the S110 ...
- 635
13
votes
1
answer
11k
views
What is a "De-clicked" aperture control ring?
The Samyang 85mm T1.5 Cine Lens featured a "De-clicked" aperture control ring. What exactly is it?
- 2,298
32
votes
2
answers
27k
views
What is T-number / T-stop?
Usually, when discussing aperture of a lens, F-stop and F-number are used for quantifying. But some photographers, and especially videographers, also mention T-stop. The concept and numbering used (e....
- 32k
10
votes
3
answers
2k
views
What is the technical name for a zoom lens which has a fixed maximum aperture?
What is the technical name for a lens which has the same maximum aperture throughout the entire zoom range?
- 5,612
26
votes
4
answers
6k
views
What is a "fast" lens?
I've been reading lots of camera reviews lately and have ran across several references to "fast" lenses.
What exactly is a fast lens and what are its advantages compared to other lenses?
- 363
23
votes
7
answers
14k
views
How can aperture be f/11 on a lens with an aperture range designation of 3.5-5.6?
I made a series of outdoor shots with Nikon D5000, with the 18-55mm 1:3.5-5.6G VR kit lens.
On some shots, I see in the EXIF info f/11, and in another shot, f/9.
How can that be, that the f-number ...
- 1,097
14
votes
6
answers
12k
views
What is the meaning of "stopped down"?
Was reading this answer (emphasis mine):
It also tells us that the lens was stopped down, as if it were wide open there would be no corners to cause diffraction, regardless of the number of ...
- 3,350
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