Aperture is the opening in the diaphragm of a camera lens.
7
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3answers
548 views
how the camera determines correct aperture and ISO in bulb mode?
Consider that the camera is in shutter priority and the exposure time is set to bulb mode.
Now the camera doesn't know how long the shutter is going to be open in advance and so how does the camera ...
2
votes
1answer
158 views
Why do the Nikon V1 lens' websites seem to give different f-stops than the lenses? [duplicate]
Possible Duplicate:
How can aperture be f/11 on a lens with an aperture range designation of 3.5-5.5?
I am a recent (and so far quite pleased) owner of a Nikon V1. I am in the process of ...
1
vote
3answers
306 views
How to calculate f-stop and ISO equivalents for a Lomography Spinner 360°?
In this review, there's this paragraph explaining f-stop and ISO equivalents:
The two aperture settings are marked with the sunny and cloudy symbols
which equate to f16 and f8.0 respectively ...
9
votes
2answers
1k views
Why don't comparisons of aperture take sensor size into account?
When one compares focal length, many times we use the 35mm equivalent length. A 50mm lens on an APS-C sensor camera(1.6x) would be a 80mm equiv. length on a full frame camera.
But when we state the ...
2
votes
3answers
590 views
What are the types of aperture blades?
The Canon EF 24-105mm f/4 L USM IS lens has rounded aperture blades. What other types of aperture blades are there, and what are the advantages and disadvantages of each of them? Is the aperture ...
2
votes
3answers
173 views
DOF and picture quality
Is it possible to say that picture quality is better with small f number but on very small DOF, so this perfect quality degrades very quickly?
So basically is there any reason to shoot with big ...
0
votes
1answer
445 views
What impact on image resolution does the aperture have?
What is the effects on depth of field, signal to noise ratio and image resolution when reducing the aperture?
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1answer
117 views
My “flag” option is gone from Aperture
I have always used the "flag" option to tag my favorite pictures to go to later, but for some reason it's no longer there. Did I accidentally press on something that took it away?? Anyone know what I ...
10
votes
2answers
287 views
Max aperture on zoom lenses - stepwise or linear?
When zooming with lenses without a fixed max aperture, the change in aperture* that the camera displays is stepwise, usually in steps of thirds. But, is the max aperture really the same all the way as ...
3
votes
0answers
72 views
Forgive my ignorance: Aperture changes as I zoom in why? [duplicate]
Possible Duplicate:
Why do zoom lenses and compact cameras have varied maximum aperture across the zoom range?
Just starting out with lacrosse pictures on my new Canon EOS 60D and zoom lens ...
15
votes
2answers
532 views
Do rounded edges on aperture blades improve image sharpness, and how?
In the description for the XF lenses for its new X-Pro system, Fujifilm crows:
The [XF lenses] all offer precise control over depth-of-field and deliver excellent out-of-focus bokeh thanks to the ...
2
votes
2answers
215 views
Why are the area of aperture, focal length, and amount of light specified in these terms?
So I'm looking at the wikipedia article on Aperture, and I'm a bit confused. I understand aperture to be the diameter of the hole that lets light in. In the article, someone states that
The ...
0
votes
3answers
3k views
What is the relationship of aperture, focal length, and ISO in a SLR?
I was using Nikon digital camera, and recently bought a Canon 550D. I am totally new to SLR.
I am not familiar with SLR terms: Aperture, focal length and ISO, and their relation to one another.
What ...
11
votes
2answers
1k 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 ...
-2
votes
1answer
404 views
How does aperture affect exposure?
I've heard that aperture can change the exposure, but I would like to know if this is true, and how it does it.
P.S. I hope this question isn't dumb like my last two.
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votes
1answer
237 views
Is there a way to create a tilt-shift photography effect without changing aperture? [duplicate]
Possible Duplicate:
How to get a miniature effect on pictures without special equipment?
I recently asked a question that was closed, and this question is not the same. I am still trying to ...
-2
votes
1answer
390 views
How can I use aperture to make my pictures better? [duplicate]
Possible Duplicate:
What is aperture, and how does it affect my photographs?
I've recently started trying to change the aperture level on my camera to get cool effects, and I would like to ...
15
votes
7answers
827 views
Why isn't my variable-aperture photo more interesting?
I took a photo where I changed the aperture of the lens during the exposure. I was hoping to get a cool or unusual effect, but I didn't. Why not, and is there any really interesting effect that I ...
4
votes
4answers
340 views
How can I take hi-speed photos of water rockets?
How can I take a picture of water rockets as they fly through the air? What settings would be best under normal daylight conditions? What is the slowest shutter speed I can use that the lighting will ...
2
votes
1answer
101 views
Why does an aperture crop the image when you look through a lens itself but not when you look through the viewfinder?
I have been studying lenses for two days now and the aperture is very confusing.
Based on the question here it appears that the aperture should not crop the image at all but when I look through a lens ...
0
votes
2answers
195 views
What aperture should be preferred while shooting the subject which is close enough, to get maximum sharpness?
From here: http://photo.stackexchange.com/a/20930/5205
f/8 sounds like a small aperture, and it might be good enough to get everything in focus in a landscape, but the closer (more magnified) your ...
4
votes
4answers
490 views
Do bigger focal lengths capture more light?
I never understood what the f really stands for in the f-stop values, like f/1.8. Wikipedia explains it in various articles, but I still find it very confusing. What I understand, though, is that it ...
2
votes
1answer
276 views
autofocus and maximum aperture of 60D [duplicate]
Possible Duplicate:
What are the aperture limits for autofocus on Canon DSLR cameras?
It is mentioned on page 79 of the EOS 60D manual that the center point AF is twice as accurate at ...
6
votes
2answers
338 views
What is the effective aperture of two stacked lenses for macro?
Is there a way to calculate the aperture of two lenses stacked together for macro? In my specific case, I have 90mm f/2.8 and 18mm 1/3.5 lenses.
5
votes
1answer
584 views
Why does my camera show “f00” when using extension tubes for shooting close ups?
As a beginner in close up photography, I am using extension tubes with my Canon 550D and standard 18-55mm lens. I noticed that when I use this, the f-stop meter in the camera does not work and always ...
7
votes
4answers
759 views
Why are my photos taken at f/11 less sharp than those taken at a wider aperture?
I am new to photography. I have Fujifilm FinePix HS10 camera. Lately I was trying my hands on landscape photography.
I learnt from different tutorials that setting high aperture value gets most of ...
3
votes
5answers
2k views
In what kind of scenes does it make sense to use f/1.4 aperture?
I have been told that it is difficult to focus with an aperture of f/1.4.
So, in which kind of scenes does it actually make sense to use the f/1.4?
In portraits they say that it is important to keep ...
1
vote
1answer
378 views
Why does the max aperture change when use Nikon 60mm AF-D Micro on D90 camera?
I have found that my Nikon 60mm Micro AF-D changes aperture from 2.8 to 3.2 when used with a D90. I have tried both A and M mode. Is it by design? Why?
I intend to buy Nikon 50mm 1.4 AF-D, but it ...
3
votes
1answer
347 views
Does maximum aperture change with focus distance with the Canon 60mm f/2.8 macro lens?
This site says
The Canon EF-S 60mm f/2.8 Macro USM Lens loses 1/2 stop at 1:5, 1 stop
at 1:3, 1.5 stops at 1:1.5 and 2 stops at 1:1 (lifesize).
Can anyone confirm that at 1:5 magnification, ...
-1
votes
1answer
136 views
How do different apertures affect photographs? [duplicate]
Possible Duplicate:
What is aperture, and how does it affect my photographs?
As an amateur photographer, can someone explain to me how different apertures affect photographs?
11
votes
3answers
2k views
What settings should I use to photograph aurora borealis with a wide angle f/4 lens?
I've tried my first night photography of the stars last week. Most articles I've seen were recommending a fast lens, fully opened, @ ISO 800 and about 20 - 30s exposure, etc. Unfortunately, my only ...
7
votes
3answers
327 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 ...
0
votes
0answers
86 views
Technically what happens that aperture affects Depth of field [duplicate]
Possible Duplicates:
What exactly determines depth of field?
Technically, why is the out of focus area blurred more when using a bigger aperture?
It is obvious that the aperture affects ...
0
votes
1answer
135 views
Exif aperture larger than possible for the used lens
A photo shot with an 1:1.8 lens contains the following exif data:
ApertureValue: 1695994/1000000
MaxApertureValue: 16/10
How is this possible? Both values are <1.8
11
votes
4answers
752 views
Is overall light gathering of a lens only dependant on aperture?
My impression is that the aperture value of a lens determines its light gathering ability, but I'm not sure I understand how it works...
When considering light gathering in telescopes, it is ...
1
vote
1answer
2k views
Why does my aperture setting change as I zoom the lens on my Nikon D90?
I am new to the photography field and this something which I am not able to understand. I am playing around with my Nikon D90 along with its kit lens (18-105mm).
While reading about Depth of preview, ...
9
votes
2answers
1k views
How do DSLRs figure out what aperture to select in P mode?
In program mode, DSLRs adjust not only the ISO and the shutter speed, but also the aperture.
The aperture has a huge impact in some situations. For example, when shooting a close subject in front of ...
4
votes
2answers
1k views
Why doesn't the background become blurred when I change the aperture on my Fujifilm S4000?
I am sorry if my question is too naive, but I am a complete beginner in photography, and I think I still need to understand well what aperture is. I have a Fujifilm S4000 camera, and I know I can't do ...
3
votes
4answers
385 views
What is the technical name of the lens which has a fixed aperture but zooms?
What is the technical name for a lens which has the same maximum aperture throughout the entire zoom range?
12
votes
6answers
522 views
Why are only certain shutter speeds or apertures available?
For the exposure control function DSLRs there are specific shutter speeds available. For example there are 1/4, 1/100, 1/500. Why, even in high end DSLRs, is there no option to use a custom shutter ...
0
votes
2answers
4k views
Why Small aperture (less light) has Large depth of field? [duplicate]
Possible Duplicate:
Technically, why is the out of focus area blurred more when using a bigger aperture?
I understand that a small aperture (large aperture number eg. F/22) means large ...
12
votes
2answers
1k views
Why do wide angle prime lenses have relatively small apertures?
I've noticed that many of the wide angle prime lenses (at least for Canon) have somewhat smaller apertures than their normal or telephoto counterparts. E.g. the regular Canon 24mm prime is f/2.8 while ...
2
votes
3answers
899 views
How can I see both aperture and shutter speed in Av mode on my Canon 550D?
I used to be able to see both aperture f-number and shutter speed, and change both values on Av mode on my Canon 550 DSLR. Now, I can only see the aperture f-number and not the shutter speed on the ...
6
votes
6answers
1k views
Is it important that the Canon 1DX isn't specified to autofocus with lenses slower than f/5.6? [closed]
Seeking the lens market AND the related info WRT Canon 1D X, I found some things which seems concerning:
1st, a note from Canon's Chuck Westerfall (see here) saying:
“AF is unavailable on the ...
2
votes
1answer
370 views
How does Sunset Mode affect exposure on Canon A800?
I was puzzled recently when I did some test shots with my Canon A800 by shooting the same (landscape) scene with and without full optical zoom and with the camera program set to SCN - Sunset. (Sunset ...
2
votes
1answer
892 views
Can I adjust the aperture of a Canon T2i while shooting a movie?
Can I adjust the aperture of a Canon T2i while shooting a movie? I really want a greater depth of field when I'm shooting a movie.
1
vote
0answers
218 views
Nikkor 50mm F1.4D vs. Nikkor 50mm F1.8D [duplicate]
Possible Duplicate:
Is there a noticeable difference between 1.8 and 1.4 prime lens?
I am a new to DSLR cameras and I just recently got my Nikon D5100 camera. I am now considering buying a ...
31
votes
3answers
6k views
What apertures are required to enable autofocus, including cross-type or high-precision focusing, on Canon DSLR cameras?
This is a follow-up to Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers? I'm doing this to separate the AF aperture requirements from the linked question above. My goal ...
10
votes
2answers
3k views
Why does Canon and Nikon limit or disable autofocus beyond certain f-numbers?
One thing that I've noticed with Canon DSLR camera is they will disable or limit autofocus when the lens is below certain aperture values, which are specified in my answer to What are the aperture ...
2
votes
1answer
420 views
How to shoot sharp “landscapes” with a point and shoot camera?
So, I have been told in a thread here previously that the minimum aperture (F8) on my point and shoot camera can cause diffraction and result in losing details of the subject if too many things are in ...
