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Questions tagged [aperture]

Aperture is the opening in the diaphragm of a camera lens. For questions relating to Apple's photo management software, please use [apple-aperture] instead.

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Is it possible to get smaller aperture with diaphragm in front of the lens?

My camera has narrowest aperture of f8. To increase depth of field, could I place an opaque "filter" or lens-cap with a small hole, e.g. 12 mm for f16, on the lens? I realize that at short f.l. the ...
DrMoishe Pippik's user avatar
5 votes
1 answer
559 views

What's the history of neutral density filters instead of aperture diaphragms in compact cameras?

Some compact cameras use neutral density filters to control light rather than aperture blades, to avoid the effects of diffraction in tiny sizes. I first heard of this as a feature of the Nokia N8 ...
mattdm's user avatar
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2 answers
1k views

What is a good rule of thumb to use large aperture for portraits vs showing more background?

I recently got a Canon 50mm and have found myself probably over-using the large apertures for portraits. I'm curious if anyone has a good rule of thumb for when to avoid it. My sense is that its ...
Jonathan Winters's user avatar
5 votes
1 answer
602 views

Lens f-number and speed on adapted lenses

A lens has a focal length, and its entrance pupil has a diameter. The ratio of these is an f-number. The size of the entrance pupil is limited by the size of the front element, and we describe lenses ...
Tom Anderson's user avatar
5 votes
1 answer
482 views

What prevents a f/1.8, 24 mm - 70 mm or similar range zoom lens from being made? [duplicate]

I see that it is common to have professional grade lenses such as 24-70mm lenses made at f/2.8. After using a 50mm/1.8, I was wondering what would prevent a more versatile zoom lens to be made that ...
dev_nut's user avatar
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5 votes
3 answers
3k views

Does opening the aperture improve color contrast? (Open aperture producing more punchy colors / closed aperture more dull colors?)

I'm using some SLR legacy lenses on a mirrorless camera that I have, and I am under the (subjective) impression that if the aperture is wide open, the colors are more vibrant, while closing the ...
FotisK's user avatar
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4 votes
3 answers
637 views

Is the aperture wider at 200mm f/5.6 than at 18mm f/3.5?

Speaking of the physical aperture. When looking at the 18-200 mm, f/3.5-5.6, I wonder how this works. With diameter D = f/N I get: 18 mm / 3.5 = 5 mm 200 mm / 5.6 = 35 mm So, does the aperture ...
Simon A. Eugster's user avatar
4 votes
1 answer
1k views

The right aperture for capturing stars?

I recently had the chance to photograph an astronomical event - and this was my first foray into night-sky photography. I had two lenses that I used: 85mm f/1.2 shot at f/1.2 through f/2.8 16-35mm f/...
OnBreak.'s user avatar
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4 votes
2 answers
3k views

Why is the Depth of Field Preview button necessary?

I've looked far and wide but i cannot find the answer for this question. I know some older cameras and lenses used to have aperture rings on them, which allowed the user to set how open or closed the ...
Ben Franchuk's user avatar
4 votes
3 answers
3k views

How to make the faces clear and bright in dim light photography?

I have a Fujifilm Finepix S2980 with which I do a lot of experiments. One thing which really bothers me is taking pictures in dim light. I wish to take decent quality pictures in dim light without ...
sjsam's user avatar
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3 votes
1 answer
1k views

Can I change the camera aperture value on my Honor 8 phone?

I am planning to do some macro photography with my Honor 8 phone, i got a macro lens to clip over the phone. the problem is, i need more depth of field and hence i need to increase the f-number, the ...
maxchirag's user avatar
  • 185
3 votes
6 answers
4k views

Why do we need a DOF preview button?

Why not just show the effective depth of field, by default? What's the point of having it display a picture that's different to how the image will actually turn out? My first thought was, it must be ...
voices's user avatar
  • 615
3 votes
2 answers
511 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 ...
Daniel R's user avatar
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3 votes
1 answer
233 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 ...
Brandon K's user avatar
3 votes
1 answer
1k views

How is aperture handled when in live view mode?

When you are using the viewfinder, whatsoever the aperture value is, the lens will be in widest aperture until DOF-preview button pressed or half-shutter button.But what about the aperture value when ...
vivek_jonam's user avatar
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3 votes
4 answers
16k views

Can I use a large aperture of f/2.8 while shooting landscape photography?

Can I take a picture of a wide area such as a big house at 10m, in low light, using a large aperture of say f/2.8, at a focal length of 50mm? I will have no subject between my camera and the house.
Supratim's user avatar
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 ...
Jason's user avatar
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2 votes
5 answers
9k views

is the Nikon 35mm f/1.8 worth it after i have the kit lenses? [duplicate]

I have a Nikon DX (D5100) camera with the two most basic kit lenses: 18-55mm f/3.5-5.6 VR and 55-200mm f/4-5.6 VR. These two lenses cover lots of scenarios, but I'm starting to believe there is more ...
fejesjoco's user avatar
  • 253
2 votes
5 answers
590 views

Does an aperture value exist, where a lens creates a brighter image than the real view?

So (without limitations of the viewfinder for example) looking through the viewfinder creates a brighter image than normal view would be. The lens would then work like a funnel(collects light from ...
FW.'s user avatar
  • 432
2 votes
2 answers
2k views

Why does oil leak from the aperture ring of old lenses?

I'm assuming that the oil was there initially to lubricate the aperture blades, but why does it leak out?
Kaushik Ghose's user avatar
2 votes
2 answers
2k views

Help me understand effective f-number

If I set a lens to, say, f/2 but my focus is set to its closest point, my effective f-number won't be f/2 any more but it will be higher by a factor that depends on focal length, image magnification ...
maupertius's user avatar
2 votes
1 answer
2k views

Why do DPReview's charts show the G7X II as having an aperture around f/8?

I have a Canon G7X II camera, which has a 24-100mm f/1.8-2.8 lens. Why does DPReview's chart show it having an aperture of around f/8 at a focal length of 100mm?
marioosh's user avatar
  • 167
2 votes
2 answers
885 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 ...
Chaosphere2112's user avatar
2 votes
3 answers
473 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 ...
sharptooth's user avatar
  • 1,059
1 vote
6 answers
22k views

What are the pros and cons of constant-aperture zoom lenses, for a relative beginner?

I use a Sony NEX-5R, and I bought the Sony 18-105 F4 constant-aperture lens. I'm aware that the constant-aperture F4 gathers more light than, say a F3.5 - 5.6, and it gives you more control over the ...
Kartick Vaddadi's user avatar
1 vote
3 answers
536 views

Apertures required to enable autofocus on Rebel T6s/T6i in Live View?

The question "What apertures are required to enable autofocus, including cross-type or high-precision focusing, on Canon DSLR cameras?" is very useful. However, would the new Canon Hybrid CMOS AF III ...
Kurt's user avatar
  • 11
1 vote
3 answers
1k views

Why did Pentax change to open-aperture metering when this causes the need to stop-down for old lenses?

On my Pentax ME Super with a legacy lens (Pentax SMC 50mm 1.7) my camera meters at all aperture ring settings. Yet, if I transfer this lens to a modern Pentax DSLR, I need to stop down the lens to ...
Alex's user avatar
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1 vote
1 answer
2k views

Why does my DSLR's viewfinder ignore the aperture ring on a legacy lens?

I have a Nikon D3100, and I am borrowing an old Nikkor 50mm SLR lens (http://www.destoutz.ch/lens_50mm_f1.8_1828564.html). I've had a lot of trouble with that lens, in that pictures that appear in-...
Tom Corelis's user avatar
1 vote
2 answers
2k views

Will my camera autofocus over the full range of a telephoto lens with variable aperture?

I'm looking to get a Sigma 150-500mm f/5-6.3 for my Nikon D3300. I've been trying to wrap my head around the crop factor and how that works and how it affects auto focus. Spec sheet for my D3300 say ...
wildlifephotog's user avatar
1 vote
1 answer
752 views

I can't get the aperture to stay at f/4 and shutter speed at 1/1000 in manual mode on a sony a6000

When I set the aperture and shutter speed on my a6000 in manual mode the aperture always changes when I take the photo. I am using a sony 24-240mm lens f/3.5-6.3. It does the same in aperture mode. ...
Kerry Spong's user avatar
1 vote
2 answers
617 views

Do modern IF Macro lenses have true constant apertures?

From my basic understanding f/stop is the ratio between the aperture size and length of the lens. A majority of macro lenses feature an extending barrel. So naturally, a fully-extended f2.8 lens, ...
HelloWorld's user avatar
  • 1,155
1 vote
2 answers
166 views

Canon 70D - shooting video interviews in bright conditions with low aperture

I'm trying to shoot an interview in the middle of the, in the outdoors - which means, it's very bright. While keeping the aperture low - to keep the interviewee's face in focus, with narrow depth of ...
golosovsky's user avatar
1 vote
3 answers
2k views

tokina at-x pro 100mm f/2.8 macro for Nikon - aperture automatically changes while in manual mode

The max aperture on my Tokina 100mm at-x pro is f/2.8 but when I focus on anything closer than around 9 feet, the aperture automatically starts to close down and get progressively smaller (higher f-...
Eric's user avatar
  • 11
0 votes
4 answers
3k views

Can aperture be changed in aperture mode even with a constant maximum aperture lens?

I am new to non-auto mode. If I have a fixed aperture lens with f/2.8 16–35 mm. Does this mean I cannot change the aperture to f/4 or f/5 on my camera because the lens only supports f/2.8? Is the f/2....
starphoto's user avatar
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 ...
Muze's user avatar
  • 1
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 ...
Muze's user avatar
  • 1
0 votes
1 answer
1k views

Why is it not possible to change Aperture in Livewiev on a Nikon D5300 when using manual movie settings?

I've been using my Nikon D5300 for about 1.5 years and have recently started to use it for some video work as well. I realized that when manual movie settings are turned on and you go to live view, ...
jng224's user avatar
  • 1,608
0 votes
2 answers
17k 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 depth of ...
pradeeptp's user avatar
  • 221
0 votes
5 answers
14k views

Why doesn't the f-stop on my D7100 change when I hold +/- and change the dial in manual mode?

On my Nikon D7100, the f/stop will not go down from 14 when I hold down the +/- button and turn dial. All I get is a little number below but the photos do not change exposure when I change this number....
Katy Pauls's user avatar
0 votes
2 answers
5k 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?
chwi's user avatar
  • 151
0 votes
1 answer
2k views

fEE error using Nikon 85mm1.8 with nikon D80 camera [duplicate]

Does the Nikon 85mm 1.8 D work correctly with the Nikon D80 body? I just received mine today and keep getting error reading fEE when the lens is set to all apertures except f/16.
Lynda Griffiths-Rocha's user avatar
0 votes
2 answers
3k views

How does a camera in an automatic mode choose what exposure, aperture and ISO to use? [duplicate]

For example: Does the camera detect if the scene contains fast-moving objects and if so use a shorter shutter speed? Does it detect if the entire scene is beyond the hyperfocal distance, and there's ...
Kartick Vaddadi's user avatar
0 votes
1 answer
13k views

What is the smallest f number possible? [duplicate]

I've quite a few questions in this regard: Is there a theoretical limit? What has been achieved till date? What is commercially available today? If there is a sudden exponential increase in price ...
kBisla's user avatar
  • 549
0 votes
1 answer
976 views

Verifying the integrity of your library

After reorganizing my image collection I moved a bunch of photos between different hard drives. While copying, I did get error messages. Fortunately, I had made multiple copies before doing the ...
Pete's user avatar
  • 3,302
0 votes
3 answers
306 views

Why does my autofocus sometimes set the aperture, after the lens was in the rain for several minutes?

I'm using a Canon EOS 60D with a Canon 40mm f/2.8 STM. I bought both used about a week ago. I've had no problems except for one: sometimes the autofocus only jumps between two apertures, and the ...
gloriousCatnip's user avatar

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