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ISO is the measurement of the camera's sensor/film sensitivity to light. It is one of the 3 ways to create a well exposed image (The other two being Aperture and Shutter Speed). Typically, a higher ISO for a correctly exposed image will result in the image being more noisy/grainy.

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7answers
342 views

Are these photos ruined because of ISO? [closed]

I took a lot of photos during a family get-together and I really liked many of them. My girlfriend then edited the photos to make them look better. The photos looked GREAT on her iMac monitor but when ...
17
votes
2answers
758 views

Why do I see this yellow color shift at high ISOs and fast shutter speeds? [duplicate]

I recently purchased a full-frame DSLR with a reported highest ISO of 204,800. I’m intrigued by the possibilities of the high ISO range and how far Lightroom and Aperture (I use each of them) can ...
0
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1answer
70 views

I have acquired an old Minolta Freedom Dual point-and-shoot. What ISO does it shoot at?

I have acquired an old Minolta Freedom Dual point-and-shoot camera. It's a straightforward enough device, and pretty automatic: no user set aperture or shutter-speed settings. But obviously it's ...
2
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1answer
67 views

What does fast/normal/slow mean for Pentax auto-iso?

I'm very confused about the Pentax auto-iso implementation. What does "fast/normal/slow" mean for the Auto-iso in the menu settings? The camera in question is a K-3, but I think it applies pretty ...
5
votes
1answer
139 views

Fuji X100s: Why are high ISO settings (>6400) only available in JPEG and not in RAW?

Reading an article about the Fuji X100s, I came across this quote: [...] the high ISO setting is only available when shooting in Jpeg Fine format. When shooting in Raw the highest ISO setting is ...
7
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2answers
148 views

Do low ISO photographs need Long Exposure Noise Reduction?

I usually took long exposure photo with ISO 100, so do I really need to turn on Long Exposure NR on? It really take time for processing.
1
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0answers
77 views

What is happening in the sensor when you change the ISO? [duplicate]

I understand the relationship between ISO, aperture and shutter speed. What I'd like to know is what actually happens in the sensor when you raise or lower the ISO number? In other words, what is ...
3
votes
3answers
209 views

Shooting objects under glass with pop-up flash

I sometimes need to take photos of new devices kept behind glass at trade shows. Currently I have to depend on my camera's in-camera flash. Often the picture is spoilt because of the flash's reflected ...
0
votes
3answers
116 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 ...
5
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4answers
417 views

What “influences” the ISO sensitivity of the camera?

In comparing, let's say Canon's 600D and 100D (which are by explanation from my store guy, practically the same camera) I noticed that they have different ISO sensitivity declarations. Since, they ...
3
votes
1answer
219 views

How to denoise a dark photo with extremely high ISO?

There are situations where I would reluctantly have to turn the ISO to the larger extreme. Nevertheless I can get some photos that I pretty much like under these circumstances. Here is an example. ...
0
votes
2answers
94 views

How do i select right exposure? [duplicate]

I have canon EOS 600D and also I have following lenses: 18-55mm 55-250mm 40mm f/2.8 How do I select correct exposure. what is the sequence of priory. currently I first changing the iso, ...
2
votes
1answer
105 views

What is the fastest film (highest ISO) made commercially?

On wikipedia there is a reference to Polaroid 612 which is ISO 20000. Was there faster film? Was there faster film made for specialized purposes (say military, astronomy etc)?
0
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2answers
146 views

How about high ISO (low light) performance testing of sensor with camera's auto-ISO option?

I'm in the market for a camera with better high-ISO capability than my current ones. There are more than enough reviews on the internet that measure cameras' high ISO performance. They usually pit one ...
13
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1answer
428 views

Is it really better to shoot at full-stop ISOs?

The second half of this answer says Notice that I only shot full-stop ISO which is important with Canon DSLRs because the gain to obtain the 1/3 stops in between is applied in software by the ...
1
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3answers
987 views

What is the highest acceptable ISO to use for weddings with Canon 7D?

I recently had my first wedding shoot(yippie!). For a person like me who usually shoot still life and landscape, weddings is a whole new world. I am used to shooting at low ISO's (800 or less) but the ...
10
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5answers
343 views

For night photography with lots of unexposed areas, should I go with high iso and low exposure, or low iso and high exposure?

I have been doing so much research on iso, and for awhile I've been going with the theory that low iso= less noise, so I've been shooting at iso 100 and then adjusting my flashlights and increasing ...
1
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3answers
175 views

Can we always talk about noise difference between crop and full frame?

Let's say we have two systems: 1) full-frame camera, 80 mm lens at f/2.2 2) APS-C camera, 50 mm lens at f/1.4 The subject is the same, as well as the camera position, focus distance, shutter speed ...
0
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2answers
83 views

How to take a moving object(far distance) in outdoor low light situation?

It's always been tricky to me how to take a far distance picture(moving) in a low light situation. I don't think flashlight would help in this case since it can't reach to the moving object. For ...
1
vote
5answers
232 views

High ISO or faster lens for a distant evening portrait?

There's a kid in the apartment across the street from my west-facing house. She comes out to their balcony at about 5pm. It's a delight to see her play and I have often tried to capture her smile, but ...
4
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4answers
1k views

What ISO should I use on my Nikon D5200 to avoid visible noise in 4×6 prints?

I recently bought a Nikon D5200. For several of the photos taken the ISO setting I have used has been high — in the range of 1000 to 4000 (most of them were in poor light, without flash and in manual ...
2
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4answers
499 views

What is the best order to set exposure parameters (ISO, aperture, shutter)? [duplicate]

Let's say that you're in a very controlled environment, there is no hurry to get the shot, and you're shooting manual. In order to correctly expose the photo, what order should you alter the ISO (if ...
12
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7answers
943 views

Can someone give a simple explanation of ISO?

Can someone please explain to me what ISO means in the camera settings. In an answer to a question about taking pictures at a dance party, I was told to use ISO 1600. What does that number really ...
20
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8answers
1k views

Should higher ISOs really be preferred (all other things being equal)?

My understanding of the ISO setting on digital cameras is that, unlike film-cameras, changing the ISO does not evoke any physical change in the camera. Rather, it simply tells the camera to multiply ...
2
votes
2answers
216 views

Image stabilization versus ISO speed

I want to do hand-held, natural-light photography in low-light situations, e.g. inside a room with a small window on a rainy day. No tripod, no flash. I assume that compared to a tripod, image ...
3
votes
4answers
801 views

Does micro 4/3 have an advantage in low light due to aperture equivilence?

Recent Micro Four/Thirds sensors seem to have improved their noise performance significantly. I own a Canon 5D Mark 2 full frame DSLR and am considering purchasing an Olympus OM-D EM5 micro four ...
1
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1answer
341 views

Why doesn't the Nikon D90 use ISO lower than 200 in very bright areas? [duplicate]

I've got a D-90 Nikon and a f1.4 lens and I've found in very bright areas like beaches in the Caribbean, when I have the camera doing auto ISO and speed and fixed f-stop, sometimes I get overexposed ...
1
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1answer
151 views

Why is high speed (ISO) film more expensive than low speed film?

And why is film much more expensive than paper? Is it the silver content? Production volume? Does is it take more effort to produce larger grain?
0
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1answer
150 views

What are the biases in daytime and nighttime landscape mode?

What are the biases in day and nighttime landscape auto modes in terms of aperture, iso and shutter speeds?
5
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2answers
670 views

Why isn't expanded ISO settings (L / ISO50) enabled on Canon DSLR's by default?

It bothers me a bit when I have to hunt through menus to find the 'enable expanded ISO settings' setting in my 5D mkIII. I'd like to know why the low ISO's are disabled however and if there is any ...
17
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9answers
9k views

Is it better to shoot with a higher ISO, or use lower ISO and raise the exposure in post-processing?

Suppose there are two photos taken in the following scenario: Scenario 1 - Photo taken using ISO of 3200. Scenario 2 - Photo taken using ISO of 100. Both photos are taken in a medium light ...
3
votes
5answers
305 views

Why is a low base (minimum) ISO desirable in stills cameras?

Why is low base ISO so desirable in stills cameras, when the opposite seems to be true for digital motion picture cameras, for instance Arri Alexa, Sony F65 and F55, Canon C300, C500? As an amateur ...
2
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1answer
199 views

Why is my ISO so high in auto mode?

New user of a Canon 7D - less than 50 shots taken. Last night, I needed to take a quick picture of something that was on my cell phone with my Canon 7D I propped the phone up against a white pillow ...
3
votes
7answers
502 views

Can ISO vary on different cameras?

We all know that [ISO] + [shutter speed] + [aperture] = a great picture. Now, let's take two different (very!) cameras: Nikon D3100 vs Nikon D800 and set them on Aperture priority. Settings for the ...
0
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1answer
596 views

What does ISO stand for? [duplicate]

I've recently been learning how to use a camera, and was wondering what ISO stood for?
0
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2answers
381 views

Why does a higher ISO hinder higher video bitrates in Magic Lantern? [closed]

With Magic Lantern it's possible to increase the video bitrate up to a point your memory card can no longer keep up and Magic Lantern will notify your recording has stopped. While i can understand ...
2
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2answers
472 views

Why does EV increase as ISO increases?

From what I understand, the lower the EV value, the more exposed (bright) the image is. EV decreases as aperture decreases. More light gets in with lower apertures. EV decreases as shutter speed ...
6
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5answers
359 views

When determining exposure, is ISO typically taken into consideration secondary to aperture and shutter speed or is it equally as important?

In other words, do professional photographers typically pick the aperture and shutter speed they want and then after those are picked adjust the ISO until their exposure meter shows the shot as being ...
4
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2answers
204 views

Why does the ISO change with the shooting mode when the aperture and shutter speed are constant and using a flash?

I have a canon 60d, Canon EF-S 17-55mm f/2.8 IS USM lens, and a Canon Speedlite 430EX II TTL flash. I like to use the manual modes, such as Av and Tv but I am having some difficulties when using the ...
8
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2answers
652 views

Why doesn't a Medium Format camera exist with good performance at high ISO?

I have had a look at enough medium format offerings, but all the products seems to offer many megapixels and poor performance at high ISOs. Why doesn't a brand exist to offer slightly lower ...
7
votes
1answer
596 views

Film ISO and Push/Pull Processing

I am looking to start shooting film and have been having a look a different 35mm film. What confuses me is film that can be shot at different ISOs/exposure bias. For example Kodak says that Portra 800 ...
4
votes
2answers
224 views

Wedding cameras - disposable or ebay compacts + film

For a wedding I was thinking of trying to get some better quality disposable cameras. The highest ISO disposables seem to be 800 colour or 400 B&W (I would like to get a mix of colour and ...
7
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3answers
2k views

Why shoot a daylight outdoor photo at high iso? [duplicate]

Possible Duplicate: Are there any situations in which it makes sense to raise the ISO in bright daylight? I was looking at this image (from From Reuters blog ...
3
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7answers
2k views

Is noise related to shutter speed as well as ISO?

I understand that as I increase ISO, I'll increase the amount of noise in the resulting image. With a constant aperture I can decrease ISO and slow the shutter speed (assume a non-moving subject, ...
17
votes
5answers
3k views

What is so special about ISO 1600?

I have heard many times that to minimize noise, the highest ISO you want to use is ISO 1600, and that no matter what camera or sensor you use, once you have passed this (ISO 1600) threshold, the noise ...
12
votes
2answers
421 views

Why is the amount of photos that fit on one card dependent on ISO?

I have a Canon 550D with a 16GB SD card. I noticed that, when in P-mode, if I choose an ISO of 100 I can shoot 595 raw files on an empty card. If I choose an ISO of 200 this is 590. And if I choose ...
4
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1answer
294 views

How can a newer camera increase ISO while decreasing pixel size?

I am a bit confused as I am considering to upgrade my canon 350D to 600D. The pixel size has reduced from 6.4 microns to 4.3 microns, however, top ISO has increased from 1600 to 6400. How did that ...
25
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4answers
2k views

Why is there an ISO setting when shooting raw?

Raw files are supposed to contain mostly unprocessed data from the sensor. What's the point of having an ISO setting if it doesn't affect the amount of photons counted, but only provides ...
8
votes
4answers
364 views

What exercises can I do with a fully automatic compact camera to help me learn?

I own a Nikon Coolpix L120 camera. It's fully automatic. I am really interested in photography. Can anyone suggest me some exercises or experiments to do with this camera so that I can make a good use ...
6
votes
1answer
168 views

Best film and shutter speed for Mansfield Skylark

My daughter picked up an old Mansfield Skylark camera at a yard sale. Can anyone recommend a film type/speed and shutter speed for overcast daylight conditions? The shutter speeds are simply 'B' ...