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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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2
votes
1answer
177 views

Why isn't the aperture visibly changing on my lens when it appears like it is changing on my camera?

I own a Nikon d5300 camera and I recently purchased a Nikon 200mm f/4.0D ED-IF Micro-Nikkor lens for close-up photography. When I was testing it out today, I was shooting at f22, and my shots looked ...
0
votes
3answers
565 views

Do I use the crop factor in calculating aperture size and area?

How do I calculate the aperture size and area, considering an 35mm equivalent focal length value and non-equivalent aperture f-number (in terms of exposure, no multiplication of the crop factor of the ...
5
votes
7answers
833 views

How can I use flash with large apertures?

I get very frustrated. When I take portraits, I want to use a flash because I think they turn out better. But if I use an f-stop that is high enough to blur the background, my shutter speed only ...
9
votes
3answers
436 views

Whats the approximate aperture of a pinhole camera?

There are plenty of different pinholes you can make! Assuming I am being a little bit less creative and I am making a matchbox pinhole camera lens using a drawing pin in a sheet small sheet from an ...
7
votes
4answers
283 views

Are the aperture, ISO and shutter speed stops perfectly interchangeable?

Imagine you have an scene with shutter speed 1/60, f/8 and ISO 200. Then you change the configuration to get an equivalent exposure: speed 1/120, f/5.6, ISO 200 (plus one stop in speed, minus one stop ...
1
vote
3answers
778 views

Why are big apertures used for landscape photography?

If it is true that a large aperture means shallow depth of field..a.k.a near objects in focus and background or far objects in blur, then how come big aperture is recommended for landscape ...
0
votes
0answers
45 views

Not able to achieve shallow dof with aperture of f/4 in nikond5200 [duplicate]

I set my aperture to 4 and yet I cannot blur out the object that is 10 ft away. Everything is in focus. I only wanted the near object which is 3 ft away to be in focus.
1
vote
1answer
341 views

How can I set the aperture manually when using an old teleconverter on my Nikon D80?

I have a Nikon D80, and I use it with the Tamron 70-300 and an old 2x teleconverter. When I mount both of them on my camera in Manual mode, I can change the shutter speed but I can't set the aperture. ...
5
votes
3answers
229 views

How do waterproof lenses focus underwater?

Our eyes need air in front of them to be able to focus properly, that's why when we go swimming using goggles, our surroundings are much clearer than without. So my question is, how do waterproof ...
0
votes
0answers
43 views

Technical question about aperture and lens [duplicate]

F stop = focal length / iris diameter So for example, my Lumix 20mm pancake, f1.7, has iris diameter of 12mm at that f stop, correct? So if Panasonic wanted to make a faster lens, could they do it ...
0
votes
0answers
40 views

Aperture smart album to find stacks containing photos?

Can I create a smart album that searches for a keyword in photos, then shows all the images in the stacks containing those photos? For instance, I have a bunch of stacks containing 2 photos each, one ...
1
vote
1answer
84 views

Are lens adapters with mechanical aperture control really working well?

This answer about a lens adapter with a mechanical aperture control (like these 1,2) got me thinking - Is it possible to control the aperture of a lens in this way? To me the answers to this question ...
0
votes
1answer
31 views

Aperture of Photography [duplicate]

I am a beginner. Can anyone state what it means if anyone says "The aperture of the photo/pic is not correct."? I donot know what actually aperture means.
2
votes
2answers
106 views

Why refer to “aperture” as “iris”?

With common lenses the aperture is controlled by a mechanism called an "iris." But, especially with cine/video-oriented lenses, I often see the term "iris" used as an apparent synonym for aperture. ...
0
votes
2answers
168 views

does depth of field travel with the focal plane?

for simplicity it can be assumed all of the following discussion is relative to a prime lens i recently learned about the technique of hyperfocal distance focusing. that is, by using the method to ...
1
vote
1answer
452 views

Which of my lenses to choose for shooting the Milky Way? 17mm 2.8 or 10mm 4.5?

Next week I hope to get a good chance to do my first Milky Way shoot. Last thing I struggle with is which of my lenses to use. I want to avoid startrails. In the final round are: Sigma 17-50 2.8 ...
2
votes
3answers
1k 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 ...
0
votes
1answer
86 views

what is the barriers of making fast lenses? [duplicate]

I know there are lenses like f/0.7 However as a beginner I'm wondering what's the barrier of making ultra fast lenses like f/0.01 ? Also if lens manufacturers willing to make wide aperture lenses, ...
0
votes
1answer
144 views

Where can I find tables of common shutter speed and aperture values? [duplicate]

I'm working on image processing software (mind that I'm a programmer and when talking about photography, I'm "tabula almost rasa"). In this software, I'm using a RAW decoder that returns a data ...
1
vote
2answers
189 views

How does Rokinon 24mm f/1.4 image quality compare between f/1.4 and stopped-down to f/4?

I have a Rokinon 14mm f/2.8 lens that I use as my go to for dark sky imaging with my full frame camera and it is amazing. However, I just bought a Rokinon 24mm f/1.4 lens for my crop sensor camera so ...
5
votes
6answers
1k views

Difference between short/long exposure for faraway objects?

Say I want to take a landscape-type photograph of some large object in the distant (focus at infinity); for instance a mountain range at the horizon, or even the moon. Suppose no closer objects appear ...
0
votes
4answers
118 views

What is the limiting factor of picture resolution?

What is the limiting factor? E.g (thought experiment) If we are 200m away from a tree (let's pretend it's perfectly stationary) and we take an exposure for a week, shouldn't we collect enough photons ...
6
votes
2answers
1k views

What is the relation between shutter speed and exposure compensation in aperture priority?

I was using a manual focus lens with canon 600D and notice something in aperture priority mode. When I was applying the exposure compensation of -2EV, I had a shutter speed of 1/20 sec and when the ...
2
votes
1answer
178 views

How to find numerical aperture of lens

I need to find the precise collection cone angle of an arbitrary objective at an arbitrary (but known and finite) object-side focal length. This is typically given as the "numerical aperture", defined ...
0
votes
0answers
72 views

Aperture? Have i got this wrong? [duplicate]

At the widest aperture the depth of field was shallow. So the object was clear, sharp and the background was blurry. And the shutter speed was shorter. The larger the aperture, the smaller the area in ...
0
votes
2answers
218 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 ...
14
votes
2answers
2k 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 ...
1
vote
1answer
85 views

Is there a way to quickly take two photos at different apertures?

I would sometimes like to take two shots quickly, at different apertures, such as f/2.8 and f/4, but with the same exposure value (EV). Is there a way to do this with the Sony NEX-5R? In some ...
4
votes
2answers
548 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 ...
0
votes
1answer
285 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 ...
1
vote
1answer
508 views

Can I make custom bokeh shape using a 18-55mm Nikkor lens?

Custom bokeh shapes need a large aperture. The max aperture my lens can reach is f3.5. Is it big enough for a custom bokeh? I tried but it doesn't work.
1
vote
1answer
294 views

How do analog photography light meters work?

I have a Canon AE-1 film camera. It works well and I've several FD, FL and Vivitar lenses. For recent digital cameras, I know how the light meter works. However, with this old camera, I would shed ...
2
votes
3answers
7k 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 ...
0
votes
1answer
116 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 ...
0
votes
2answers
103 views

The aperture size of my camera ( Fujifilm Sx1) is minimun of f11 can i use a filter or something to get images similar to f16 or f22

The aperture size of my camera ( Fujifilm Sx1) is minimum of f 11 can i use a filter or something to get images similar to f16 or f22
0
votes
1answer
171 views

Night photo with Leica 25mm: blur at f/1.4 [duplicate]

I have an Olympus OMD EM5 and a Leica 25mm which takes wonderful pictures in daylight. I was trying to take night pictures with this setup and I had the following results (after several tries and ...
2
votes
3answers
444 views

What do the specifications mean on the Canon G15's lens?

I am quite new to photography, but spent some days understanding aperture, timing, zoom and ISO. Now I see the values printed on the Canon Powershot G15´s lenses, and I can´t interpret them. I ...
6
votes
4answers
712 views

Is f/number more relevant than aperture and/or shutter speed?

I've seen on Flickr that the photographers specify values for four settings about their photos (where exif data is available) - Shutter speed F number ISO Focal Length An example can be found ...
0
votes
3answers
113 views

Canon Film SLR 28-80 mm lens with sunfilter; what should be my aperture settings and distance

With the Canon Film SLR 28-80 mm lens with sunfilter (I think it has zero impact on focal length) what should be my aperture settings, if I have to take pictures of people in crowd and restaurant to ...
2
votes
2answers
138 views

How do I determine the actual calibrated specifications of a Holga?

I've decided to get back to using my Holga, and while in the past I've been happy with the the pics I have taken, I started thinking about how "accurate" the settings on the camera are. (Yes I know ...
1
vote
1answer
127 views

Nikon P7800: Why is that different apertures result in different shortest shutter speeds?

While testing my new Nikon P7800 i came across the fact, that it cannot shoot at 1/4000 s through its entire aperture range, which is f2 - f8 @ 24mm (full frame equivalent). At f2 i can only go down ...
2
votes
1answer
2k 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 ...
3
votes
2answers
123 views

What will be my aperture with a 2× teleconverter? [duplicate]

I have a Canon 60D (crop factor 1.6x) and an 85mm f1.8 prime lens. Now I want to add a 2x teleconverter and attach the 85mm lens to it. My question is: What will the effective aperture be?
3
votes
1answer
320 views

How does the Dandelion chip affect the aperture lever with old lenses on Nikon D3200?

I'm trying to understand how adding the Dandelion chip to an old lens works in practice. I understand that the chip is programmed by the user with the focal length and max and min aperture. Am I right ...
4
votes
3answers
634 views

Why do landscape photos with large apertures have dark corners?

I'm currently reading Bryan Peterson's Understanding Exposure and wanted to test his suggestion that f/11 or larger for landscapes can produce sharper photos. Perhaps not the best test but I took a ...
19
votes
4answers
12k views

Why is the aperture ring removed from new Nikon lenses?

Maybe I'm wrong, but I notice that Nikon's newer lenses don't have an aperture ring. For example, an older AF 35 mm f/2D is now replaced by AF-S DX 35 mm f/1.8G, or AF 50 mm f/1.8D is replaced by a ...
3
votes
2answers
231 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 ...
9
votes
3answers
845 views

When using an Extender, does it actually change the Aperture of the lens?

I just bought a Canon 2X Extender and I always believed that It would only result in 2 Stops loss of light and not change the aperture. When I tested this extender on a Canon 135mm F/2 lens, the ...
5
votes
1answer
6k views

Why does my aperture setting change as I zoom on my DSLR kit lens?

I am new to the photography field, there are few things 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 ...
0
votes
0answers
114 views

What is the basic relationship between aperture and focal length? [duplicate]

How does a photograph vary with a decrease or increase in aperture as well as focal length?