All Questions
10
questions
0
votes
2
answers
118
views
Aperature/f stops/lenses [duplicate]
I am interested in landscape photography and a common point I hear thrown around is that a higher aperture (f11-f22) is best for landscape photos. However, every blog, YouTube video and photography ...
0
votes
2
answers
66
views
How do constant aperture zooms produce identical exposure, even though focal length is larger? [duplicate]
My understanding is that a larger focal length corresponds to a larger working aperture diameter, since the numerator is larger.
Why doesn't a larger working diameter correspond to a brighter image? ...
6
votes
2
answers
1k
views
How does sensor size affect the brightness of an image given the same field of view and aperture?
Lets say we have two image sensors, each one with 1MPixel resolution but differing in size. The first sensor has the size 1/3", the other one 1".
Each sensor is equipped with a suitable lens (for the ...
4
votes
1
answer
25k
views
What is the largest aperture on a commercially available lens? [duplicate]
Out of pure curiosity, what is the largest aperture, or lowest f-stop, a commercially available lens has. I have seen the 50mm prime lens from canon with 1.2, but not lower than that. What are the ...
12
votes
2
answers
3k
views
Do lenses with the same f-stop but different focal length gather the same amount of light? [duplicate]
I'm taking images of a light source in a scientific labratory, and I thought I had a good grasp on all these things, but now i'm second guessing myself after some results. The most important thing is ...
3
votes
1
answer
433
views
How do I properly understand what f-stop is? [duplicate]
I don't quite understand why most lenses seem to have approximately the same diameter aperture regardless of focal length.
F-stop is, by definition, a ratio of focal length to diameter, so a 20mm ...
19
votes
2
answers
4k
views
Does a specific f number across all lenses denote same amount of light?
When we say a light source emits 1500 lumens of light, it does not really matter if the light source is incandescent, CFL, diode etc. Similarly, when I say f/1.8 can I assume that all lenses pass the ...
11
votes
3
answers
900
views
What is the limiting factor in lens construction when it comes to f-stop values?
This widely praised Nikon 105mm macro lens has a maximum f-stop value of 2.8. I've held it in my hands, it's a big lens. Meanwhile, this 50mm Nikon lens can go up to f/1.2, despite being 25% cheaper ...
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 ...
36
votes
4
answers
8k
views
How do you find out the "sweet spot" of a lens?
I've tried googling this, but have never found a satisfactory answer.
I've heard the term "sweet spot" thrown around by some photographers to mean the f-stop of a lens which results in the highest ...