All Questions
Tagged with aperture lens-design
34
questions
12
votes
6
answers
8k
views
What are the theoretical minimum and maximum apertures?
Is there such a thing as a maximum aperture that a lens can be open to? What about a minimum aperture that it can be closed to? Do these concepts even make any sense? Is there a lens with the ...
- 33.1k
18
votes
2
answers
3k
views
In what way does the lens mount limit the maximum possible aperture of a lens?
In many answers to questions about different aspects of really large aperture lenses it's pointed out that the lens mount sets a hard limit on the maximum possible aperture of the lenses to that ...
- 33.1k
5
votes
2
answers
2k
views
Why do zooms have small apertures even around 50mm?
A 50mm f/1.8 prime from one of the major manufacturers can easily be found for $200 or less, but zooms that include 50mm in their range always seem to have much smaller apertures even at 50mm until ...
CommunityBot
- 1
2
votes
3
answers
440
views
Is diffraction limited aperture independent of lens?
I have always understood diffraction limited aperture as a property of the camera and its sensor, not of the lens. The camera has a certain sensor size and a certain megapixel count, which together ...
CommunityBot
- 1
1
vote
0
answers
292
views
Why won’t the aperture adjust on my Sony A camera? [closed]
I recently bought a telezoom objective without built-in AF. I did not bother because my camera has an AF which could handle the focus on such lenses.
I always had used lenses with built-in AF so I did ...
- 173
18
votes
8
answers
9k
views
Will using a lens at max aperture ("wide open") result in poor images?
I’m looking to add a second lens to my kit lens I got with my Nikon D7000.
I have read several reviews on both the 35 and 50 mm lenses made by Nikon in particular that said using either lens at the ...
- 745
46
votes
7
answers
14k
views
How do constant aperture zoom lenses work?
Cheaper zoom lenses usually are faster at the wide end and slower at the long end (for example, the $150 Canon EF-S 18-55mm f/3.5-5.6). More expensive constant-aperture zoom lenses have the same ...
CommunityBot
- 1
0
votes
3
answers
173
views
Does a camera have to have a contiguous housing?
The lens group in this picture would have its own protective lens tubes like the one on a camera but one for each lens group. What would be an issue having a gap between the lens group and stray light ...
- 33.1k
14
votes
2
answers
1k
views
How do apertures which seem too large to physically fit work? [duplicate]
A 400mm f4.0 lens is supposed to have a maximum aperture diameter of 10cm. Looking at such a lens they don't seem big enough to fit that kind of aperture including all the mechanics for control inside ...
- 33.1k
9
votes
4
answers
1k
views
What motivated lens makers to now use 1/3 f-stops rather than say 1/4 or 1/2 stops?
I've noticed that many older lens have just hard f-stops for lens (2, 2.8, etc). However, since the aperture wheel for some is continuous you can "stop" are some arbitrary point and shoot. From my ...
- 176k
3
votes
2
answers
210
views
Are bokeh (ball) shapes a result of vignette or aperture action?
The effect of getting shaped out-of-focus highlights (bokeh balls) from both non-circular apertures inside the lens, and masks applied in front of it (where an external aperture would presumably also ...
CommunityBot
- 1
2
votes
1
answer
969
views
Why don't all zoom lenses have variable f-numbers? [duplicate]
As I understand it, the f-number is a ratio between the focal length and the aperture diameter. A zoom lens can change focal length, but shouldn't the maximum aperture be a fixed size? If so, that ...
- 176k
22
votes
2
answers
5k
views
Why do zoom lenses and compact cameras have varied maximum aperture across the zoom range?
Why does a camera's maximum (allowed) aperture get smaller when you increase its zoom?
- 1,530
1
vote
1
answer
200
views
Why is Auto on aperture rings near the smallest aperture?
This is something that has puzzled me for a while and it always seems counter-intuitive. When a lens has an aperture ring with an auto position (A), it is always (at least on 3 systems that I have ...
- 36
15
votes
3
answers
2k
views
How do zoom lenses restrict their widest aperture at the telephoto end?
Does the aperture ring lock the apertures beyond, say 5.6 at length lens's telephoto end?
Does the lens introduce an obstacle to the aperture ring so the lens can't be opened anymore beyond the ...
- 176k
Hot Network Questions
- Would auto-update policies have contained the Crowdstrike outage?
- Uniqueness results that follow from CH
- Solid border Yin-Yang
- What is a simpler method to find the analytical expression for the function f[x]?
- Why is 不 instead of 没 used to negate an action in the past in 过去三天为什么你不回我的电话?
- Incorrect affiliation on publication
- From which notable Europa's surface features could be possible to observe Jupiter eclipsing the sun?
- What is this huge mosquito looking insect?
- Civic Responsibility on London Railway regarding others tailgating us
- Create DevOps cycle in TikZ
- What is the maximum number of real roots in the interval (0,1) of a monic polynomial with integer coefficients and has degree 2022.
- How to address imbalanced work assignments to new boss?
- Dividing shape into 2 congruent pieces
- Can true ever be false?
- Reduce a string up to idempotency
- Can a non-inertial frame be viewed as an inertial frame
- Is this an umlaut above a y in this 1922 Patronatsschein?
- Why do some license agreements ask for the signee's date of birth?
- Limited list of words for a text or glyph-based messaging system
- How to Isolate my Power Supply Circuit from Mains?
- When given a wide passage such as the left-hand part in bars 20-21 - should my fingering seek to avoid the thumb on black keys?
- Why does this 4-week Treasury bill that I bought have a 17-week term and a much earlier issue date?
- How do you cite an entire magazine/periodical?
- Mathematical proof that viscous damping always diminishes energy