All Questions
26
questions
0
votes
2
answers
1k
views
There are many f2.8 zooms for FF. Why are there so few f2/f1.8 zooms for APS-C?
APS-C/Super35 cameras are less staple for film than they were before, but are still widely used. Besides, there are quite a few semi-professional APS-C DSLRs on the market.
As far as I understand, a ...
- 165
0
votes
1
answer
221
views
Can a camera be a mile long?
Could parts of a camera be spaced out over a distance rather then together to work in a way a normal camera cannot? What characteristics would this camera have over a normal camera?
In the picture ...
- 1
1
vote
1
answer
167
views
Is there an online lens diffraction and maximum sharpness table?
I simply want to see an table that lists the lens diffraction limit of each camera.
I have came across this well done answer with animated PNG
and I realized there i also the perfect sharpness ...
- 2,019
1
vote
2
answers
718
views
Relationship between f-number and amount of light being let into the lens system [duplicate]
Why does smaller f-number imply greater aperture diameter and consequently, greater amount of light entering the lens of a camera?
As evidenced from my study across a number of resources, an absolute ...
- 177
5
votes
3
answers
2k
views
Can I force the aperture to stay open on macro lens?
I have a sigma 180mm f/2.8 lens, which I bought because it was the largest aperture I could find that focuses around 0.5m See this question for why this was important.. Upon arrival, however, the lens ...
- 215
7
votes
2
answers
356
views
Why is the aperture of this old lens showing as centered blue glare?
I just bought a old Minolta MD Zoom 35-135mm 1:3.5-4.5 lens together with two old Minolta SLRs to get into film photography.
Before using actual film I adapted it to my Canon 600D (using a no-name MD-...
- 249
1
vote
2
answers
595
views
Does the sensor size matters in the size and weight of an equivalent lens? Why?
In other words, does the size of projected image circle matters in the size and weight of two lenses with the same aperture/DOF (different f-number) and field of view (different mm)? All other things ...
- 129
2
votes
3
answers
475
views
What's the intended use of lens with f-numbers close to or "faster" than f/1?
Lens with f/1.2 are rather expensive and not very widespread. Lens with f/0.95, f/0.85, f/0.8 do exist but they are also very expensive and quite rare. Lens with f/0.7 are so rare that some of them ...
- 1,059
4
votes
3
answers
3k
views
Which formula for f-numbers is correct: f/D or 1/(2NA)?
I've seen two different definitions for the f-number of a general-purpose lens. Are they consistent ?
I'm assuming that subjects are distant (not macro, magnification is small), and we have a lens ...
- 41
1
vote
3
answers
3k
views
What factors make a lens brighter? [duplicate]
Let's say I have two lenses of 50mm, one with maximum aperture f/1.8 and another with f/1.4.
I understand that when using maximum aperture, for the latter lens more light will get to the film or ...
- 533
6
votes
2
answers
2k
views
Why are large zoom ratio constant apertures lenses not generally available?
I know about 17-55 f2.8 and the likes of it, but I am talking about something say 18-135 f2.8. There exists 70-200mm f2.8 and the range (200-70 = 130mm) is much bigger than in 18-135.
I am aware of ...
- 309
0
votes
1
answer
486
views
Aperture and field of view - percepted by eye vs camera
I very well informed and I know about how aperture works and why is it not restricting field of view, but I somehow cannot get around the following:
Aperture doesn't restrict field of view for the ...
- 101
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 ...
- 459
3
votes
2
answers
513
views
How to compare the speed of lenses taking transmission into account?
When comparing the speed of two lenses, you almost exclusively hear about the maximum aperture. This of course makes sense, since at a certain lighting condition, a larger aperture in general allows a ...
- 304
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
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