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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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224 views

If I want to shoot darker shots, is it better to increase the lighting and then darken in post to retain clarity?

I'm just getting started - in my last shoot, I was using a 6D with a 50mm/1.4. In low light, the pictures looked fantastic on the viewfinder but on the computer screen, appeared extremely grainy. ...
1
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2answers
95 views

How can I change the ISO value on a Nikon D300S without taking my eye from the viewfinder?

I came from a Canon 450D to Nikon D300S and I have one minor complaint. The Canon allowed me to change all exposure settings while looking through the viewfinder and shooting in manual. In the Nikon, ...
3
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2answers
90 views

Does anyone make an ASA 1600 or 3200 color film?

I have never found anything more light sensitive than 800 in color film. Wondering why that is.
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1answer
46 views

How does ISO setting change CCD/CMOS sensor behavior? [duplicate]

In order to understand the technology in a digital camera, I considered the following question: How does ISO setting change CCD/CMOS sensor behavior? For example, does ISO setting affect the amount ...
3
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1answer
334 views

Why are ISO settings not available/grayed out on Nikon 5100 in auto mode?

I have a Nikon 5100 and the option to change the ISO settings on Auto mode isn't available. The option is grayed out and it's stuck on auto. The ability to change ISO setting is only available when ...
36
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8answers
13k views

What are the advantages and disadvantages of using auto ISO on a DSLR?

What are the advantages and disadvantages of using auto ISO on a DSLR? Using manual ISO obviously gives you more control, but auto ISO may mean that you get "the shot" under quickly changing ...
0
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3answers
2k 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 ...
5
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1answer
125 views

Can I get Photographic Paper with lower ISO?

I have been playing around with pinhole cameras using photographic paper (instead of film). Great fun. But when I buy photographic paper, I don't seem to have any options for different ISOs, like I do ...
2
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3answers
101 views

how many stops different are a 100 ISO film stock and an EI 320 film stock, and which is faster

how many stops different are a 100 ISO film stock and an EI320 film stock , and which is faster?
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2answers
187 views

If I shot Tri-X 400 at ASA 800, should I develop at 800, and can I go all the way to 1200?

I shot 8 rolls of tri-x 400 on an olympus xa-2. I set the asa on the xa-2 to 800, 1 stop over. Should I develop at 800? ie push 1 stop? I would like to develop at maybe 1200, ie push 1.5 stops. ...
2
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1answer
76 views

Why are there shiny bits in my night photo?

Fisheye lens, so no UV filter installed that can mirror it. ISO 800, 10s shutter, Canon 40D my guess is in-camera high ISO reduction algorithm gone awry. could be? Edit: I was talking about the bits ...
14
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1answer
2k 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 ...
94
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5answers
7k views

What is “ISO” on a digital camera?

What is "ISO" in general, and how is the scale defined? How does the ISO scale for film speed differ from ISO sensitivity as used in digital cameras? Is lower ISO always better?
4
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2answers
133 views

Is analog gain really actually power-of-two only?

Context I'm using a Nikon D5200, which features extra ISO values between powers of two, that the Nikon D60 did not offer. D60 offers 100, 200, 400, 800, 1600 (1-stop interval). D5200 offers two ...
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0answers
37 views

I can't seem to take photos properly with my Diana F+

I have a Diana F+ and im using a 35mm film. Can someone kindly explain to me how to properly use a Diana? And how can you move the white dot, because I can't seem to. How will you know how much film ...
2
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4answers
427 views

Sony a7: Is there more noise for ISO <100?

I have a Sony a7 (original). And on the camera it has a feature my old Canon DSLRs never had: it allows me to select ISO values LOWER than 100. I understand the point of these lower ISO values: I ...
0
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0answers
122 views

Canon L Lens producing higher noise/grain? (24-70mm f2.8 II)

I just purchased a brand new 24-70mm f2.8 II for my upcoming trip. I've been testing out this lens for the past few days, and have noticed something that I'm a bit confused by. It seems by my tests, ...
14
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3answers
2k views

What exactly is “base ISO” and how do I find what is base ISO on my camera?

If I understood correctly, base ISO is in full stop steps from the lowest possible ISO setting on my camera. For example if the lowest setting on my camera is ISO 100, than the following table would ...
3
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6answers
227 views

How can I see the photo settings like f-stop, ISO etc. of a image?

I am new to photography and enjoying shooting with my Nikon D3200 camera. Once I take a photo, is there any tool by Nikon or a third party which can give me info like F-stop, ISO, Shutter speed, etc? ...
1
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1answer
60 views

Paper ISO with no filtering

I'm looking at the Fomaspeed VARIANT paper's technical sheet. I want to learn what is the ISO speed of this film (I need this to evaluate the exposure time in a pinhole camera) - and the spec says ...
2
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3answers
1k 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 ...
22
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5answers
3k views

What is exposure compensation?

What does exposure compensation do? If I take a photo with a given shutter speed, aperature, and ISO, and then take the same shot with +1EV or -1EV, what is actually happening? Is this just a gain ...
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2answers
129 views

How do shutter speed, ISO and aperture work together to control exposure?

When shooting in natural or ambient artificial light (without flash, basically), how do light, shutter speed, ISO and aperture work together to control exposure?
11
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3answers
2k views

How can I reduce noise at ISO 100 in photos taken in the twilight?

I shoot with a Canon EOS Rebel T5 and sometimes see noise even when shooting at ISO 100. Is this just because there is not enough light in the dark portions of the picture (seen below)? Is this a ...
24
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8answers
29k 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 ...
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0answers
37 views

Photography: Set ISO higher or use software edit later? [duplicate]

I'm very curious these days about ISO in photography. I research internet but I didn't find answers to my questions. I want to find the differences between "ISO" and "EV" and "Brightness". I know ...
7
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5answers
2k views

Does noise in images depend upon “Megapixels” or “ISO”?

I have a question about image quality. Does noise in an image is depends upon "Megapixels" or on "ISO"?
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4answers
3k views

Why is my ISO so high when shooting indoor photos with flash

I have a Nikon D5100. When shooting indoor photos using the built in flash, the auto ISO changes to 1600 or so. Doesn't the flash produce enough light so that the ISO would stay at 100 or so? ...
0
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0answers
38 views

How to understand a quote for the correct exposure when shooting ColorChecker?

The problem concerns the examination of the correct exposure photographing a colorchecker... Manual mode, fixed ISO 100 (camera dafault), other values read from the lightmeter ... and now: Can you ...
5
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1answer
221 views

What do “dark current” and “sensitivity” mean for a camera module?

I am looking at a camera module to be used for a project which deals in shooting frames in dark areas and night conditions. This is a camera used from a circuit board. I have the following light ...
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2answers
115 views

System Gain vs ISO [duplicate]

Does the "system gain" (i.e. electrons/ADU) change when one changes the ISO of a digital camera? To put this another way is there an analog amplifier between the sensor and the ADC whose gain is ...
1
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6answers
451 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 ...
2
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2answers
2k views

Stopping down in manual mode with automatic ISO?

I am using a Canon 5D MKIII. I take a lot of low-light fotos and want to achieve low DOF while keeping the photos sharp with fast-moving subjects (musicians), using a 5mm 1.4 lens. So far, I always ...
5
votes
1answer
546 views

Why can't I set my Pentax K-5 IIs to ISO 100?

I recently got a K-5 IIs, and found that it can't be adjusted to under ISO 200. Even with expanded ISO mode, 160 is the lowest possible value. Can anyone help me out?
0
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2answers
113 views

Can someone explain film speeds to me? [duplicate]

I know the whole 200 400 800 is based on the speed of the film & say youre in a dark room with dim lighting, 800 would be a better choice to use.. But i have searched through flickr and i see most ...
2
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2answers
259 views

Does it make sense to “Expose to the Right” except at base ISO?

I have read in a number of places that exposing to the right (ETTR) only makes sense at your camera's base ISO, with the justification being that if you are boosting the gain in camera (by raising the ...
12
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4answers
2k views

Why is it called ISO “speed”?

As I understand it, the ISO value indicates how sensitive the sensor/film is to light. How is this related to speed? Is it something to do with how fast old chemical film developed?
4
votes
3answers
1k views

Digital ISO vs Post-Exposure Correction

As far as I know, a ISO setting on a DSLR camera corresponds to a mixture of both analog and digital settings set before a shot is taken and governs how much amplification the incidence luminosity is ...
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0answers
55 views

Difference between shutter speed, iso and Aperture [duplicate]

What are the main differences between shutter speed , iso and aperture? 1.How are they interdependent? 2.Because every three of them are controlling the light,it gets very confusing how? ...
7
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4answers
293 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 ...
3
votes
2answers
141 views

Why does ISO sensitivity affect sequential burst mode duration?

I have an Olympus E-PM2 and while testing a new SD card I learned that the camera's ISO setting affects the number of pictures that I can take using sequential burst mode. When shooting raw at 8 fps ...
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4answers
120 views

Can exposure parameters be kept high even at high ISO sensitivity, to keep image quality up?

Following is from Film speed Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ...
17
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10answers
3k views

Do DSLRs play games with ISO when used with fast lenses?

This article at Luminous Landscape claims that Nikon, Canon, and Sony silently boost ISO when their cameras are used with very fast lenses (f/1.2 and f/1.4 principally), the implications being that ...
31
votes
6answers
5k 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 ...
23
votes
11answers
3k views

Why use higher ISO when using a tripod and the object is static?

Sometimes when I see a photo such as this one, I wonder why the photographer chose such a high ISO (640), despite using a tripod with a static subject. As far as I know, a lower ISO means less noise, ...
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3answers
166 views

Optimum ISO? How can I tell? [closed]

I Own a Canon 60D what is the optimum ISO can reach without getting much Noise?
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9answers
2k 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 ...
0
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2answers
245 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 ...
43
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8answers
25k views

What does “expanded ISO” mean?

The ISO specification for the Canon EOS 7D reads as follows: High ISO For handheld shooting in low light, the EOS 7D offers ISO speeds of up to 6400. Expandable to ISO 12800, for low light ...
0
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2answers
2k views

Exposure compensation or ISO sensitivity? [duplicate]

If ambient light isn't enough and I don't have a tripod with me for long exposure, which one should I prefer to increase the brightness of my photo? I know high ISO comes with noise. Is there any ...