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by Bart Arondson

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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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94 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 ...
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1answer
66 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 ...
41
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7answers
6k views

What is a “diffraction limit”?

I've seen the term used, but what is a "diffraction limit", when should I worry about it, and what undesirable effects are a result of it ?
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0answers
19 views

How to compare a Catadioptrics light asorbtion with a reflector? [closed]

I used to have a 6" Dobsonian reflector, and the next telescope I buy, I want it to have the equivlant of about a 11/12" dobsonian reflector. I'm looking at this Nexstar VX 9.25 , it says 235mm ...
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1answer
86 views

Can't control aperture with D800 and AF-s 80-200mm D in Manual mode

I just mounted the 80-200mm AF-S 1:2.8D on my D800, the aperture ring is set to f/22 and locked. But now when I try to change the aperture in Manual and Aperture mode in my camera it doesn't change ...
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1answer
32 views

How to view a thumbnail for each lightroom folder in a catalog?

I'm trying to convert from Aperture to Lightroom. The first thing that does not make sense to me is how do you get an overview of your entire library (called catalog in lightroom)? In aperture, this ...
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1answer
95 views

Is it possible to add an aperture ring on Nikon G Lenses?

Many of the more affordable Nikon FX Lenses are G Lenses, without the aperture ring. One of my Cameras is a Nikon FG manual 35mm SLR from the 80s, which could only support a G Lens at the lowest ...
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1answer
176 views

Why does changing the aperture cause lag in live view and in videos?

On my Canon 70D there's a considerable lag during the change of aperture when pressing the depth of field preview button. This lag also occurs during video recording, which causes the video to halt ...
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0answers
69 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 ...
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4answers
147 views

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

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 ...
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2answers
81 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 ...
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2answers
188 views

Why doesn't an f/1.8 lens result in a lower ISO than an f/2.8 lens?

When I bought my Sony NEX-5R, I had a choice of an f/1.8 or an f/2.8 lens (both are prime, normal lenses). I was told the 1.8 will work better for low-light photography since it will let in lot more ...
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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 ...
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2answers
231 views

Is there a way to adjust the aperture of a Nikon lens without a camera or physical aperture ring?

If I have a camera that does not have any electronic connection to the lens, is there any way to adjust the aperture on the lens if it does not have a physical aperture ring? We're using a scientific ...
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1answer
70 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 ...
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3answers
142 views

How to change aperture in manual mode on an entry-level Nikon SLR?

In manual mode on my Nikon D3200 I cannot change just the f/stop setting. It only changes in relation to the other settings. How can I reproduce settings that I have found in books on photography if I ...
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1answer
92 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. ...
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2answers
315 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
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1answer
139 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
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1answer
72 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.
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1answer
122 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 ...
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3answers
5k 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 ...
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1answer
79 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 ...
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2answers
63 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
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3answers
10k 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 ...
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1answer
103 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
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3answers
128 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 ...
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4answers
631 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 ...
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3answers
94 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 ...
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0answers
41 views

Connection between aperture and depth of field? [duplicate]

I want to know what's the relationship between aperture and depth of field. Why depth changes as aperture is changed?
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2answers
103 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 ...
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1answer
76 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
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1answer
178 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
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2answers
102 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
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1answer
228 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 ...
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3answers
410 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 ...
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4answers
9k 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
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2answers
181 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 ...
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3answers
496 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 ...
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2answers
450 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
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1answer
4k 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 ...
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0answers
78 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?
60
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11answers
21k views

Is there a noticeable difference between 1.8 and 1.4 prime lenses?

I have been shopping around for a prime lens for my Nikon D50. I noticed that the 1.8 is hundreds of dollars cheaper than the 1.4 AF-S. What will I gain for that cost difference? Is it really ...
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3answers
127 views

Wide angle with low F stop number (eg.F2.8) in relate to depth of field

What is the purpose of having a wide angle lens like the Nikon AF-S 14-24mm f/2.8G ED with a low f/stop? For example I am shooting a landscape mountain scenery shots or group photos, why would I use ...
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2answers
212 views

What does the aperture range in a lens name mean?

Regarding lens descriptions, what does the relationship between aperture range f/3.5-6.3 and focal length range 18-270mm mean? How does this work?
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3answers
154 views

Night photography settings

I have watched a few YouTube videos now and one guy states that you should have a smaller aperture but to compensate for the lack of light coming through, you should set the shutter speed higher, ...
6
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7answers
9k views

What are some common ISO, aperture, and shutter speed settings for street photography?

I recently purchased a Panasonic GF1 with the 20mm pancake lens. It's by far the nicest camera I've ever owned and I'm really excited to learn the basics of digital photography (primarily street ...
2
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2answers
62 views

I have a Fujifilm HS25 EXR and its minimun aperture is F2.8. Is there a way of getting a lower aperture for my camera?

I have a Fujifilm HS25 EXR and its minimum aperture is F2.8, but I want it to be F1.8 (my dream is to achieve the bokeh effect) Is there a way of getting a lower aperture for my camera; maybe a lens ...
0
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3answers
172 views

Why does the live view switch off for a long time and my photo is of low quality when I take a picture in low light?

I have Nikon D3200. I am trying to take picture in A mode. I have set Aperture f/3 and ISO to 200. I am taking a picture in very low light. The problem I am facing is that when I press the shutter ...
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1answer
282 views

What are some good examples of using ND filter with wide apertures?

Usually pictures shot with ND filters look like this one. The typical recommendation is to combine ND filter with narrow aperture to get slower shutter speed. This results in a very big depth of ...