Lunch atop a (Springfield) skyscraper

Lunch atop a (Springfield) skyscraper
by andy-m                

Submit your Photo
Hall of Fame

Please participate in Meta
and help us grow.

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.

learn more… | top users | synonyms

0
votes
2answers
69 views

When to use the LV formula?

EV = log2(f^2/T) LV = EV + log2(ISO/100) Question is to those that this is already clear. It is not a math question, it is a photography question about using Light Value. My puzzlement is ...
8
votes
1answer
94 views

Who publishes standardized camera specs?

Is there any online resource that provides camera specs that adhere to ISO standards? ISO has published many standards for camera specs: Tonal response ISO 14524:2009: Methods for measuring ...
0
votes
1answer
61 views

Why is my ISO setting changing in manual mode?

I want to use Manual Mode but I don't understand why, when I set my ISO to 100, I see in the picture settings that the ISO changed to 3200. How can I set it up to be what I set and not what the ...
1
vote
3answers
222 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, ...
0
votes
1answer
52 views

How to shoot the sequence of adjusted exposures wanted for a ColorChecker?

I'm trying to shoot a sequence of photos needed for calibration. As instructed, I'm in manual mode, with fixed ISO 100 (camera dafault), and other values read from the lightmeter ... and now: Can you ...
1
vote
2answers
118 views

What could cause very underexposed photos in daylight?

I just recently started toying with the manual mode on my Canon 70D. Everything was working fine for a few shots, then all of a sudden my newer shots all appear darker under the same settings. The ...
4
votes
4answers
299 views

What is the relationship between ISO, aperture, and shutter speed?

I know digital cameras have ISO options, and that ISO is the camera's sensitivity to light, but if you set higher ISO then you can get a noisy image. I also know there are two other camera options, ...
27
votes
5answers
11k views

What is the difference between digital high ISO noise and film grain?

What is the difference between digital high ISO noise and film grain? Why does one "eat detail" and the other does not?
1
vote
0answers
281 views

Why does my Canon 24-70mm L Lens appear to produce higher noise/grain than my 50mm f/1.4 in similar environments?

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, ...
1
vote
3answers
8k views

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

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 ...
13
votes
3answers
2k 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. ...
3
votes
2answers
150 views

Can I use chemicals for developing ISO 400 film to develop ISO 100 or 200 film as well?

In my black and white photography class, the teacher recommends us to use ISO 400 to develop our film and make prints. I found that ISO 400 is much too grainy for my liking, and as a result I want to ...
10
votes
5answers
816 views

Is it possible to use a lower ISO instead of ND filters?

I've seen on the CHDK page, that you can change the ISO values, and put lower ones. Now let's suppose I want to shoot a waterfall in the daytime, and I also want a long exposure time (e.g., 10 ...
52
votes
7answers
6k views

How is ISO implemented in digital cameras?

If I change the ISO settings on my camera, obviously the gain of the system is increased, amplifying the signal from the sensor. What's not clear to me is where the amplification takes place. I see ...
1
vote
0answers
43 views

What does changing the ISO value on a digital camera actually do? [duplicate]

I'm used to film photography, where the ISO value is an indicator of the speed that the chemicals on the film strip react to incident light. For the case of the electronic sensor, what is actually ...
26
votes
4answers
3k views

Why can't the ISO level on most digital cameras be set below 80?

Why is it that the ISO level on most digital cameras doesn't seem to go lower than ISO 80? I understand (vaguely) that the sensors adjust the gain in order to achieve the equivalent of a high ISO ...
6
votes
1answer
134 views

Why are shutter speed and ISO sometimes shown in strange fractions?

Sometimes, browsing 500px or any other photo site that holds EXIF info, I see some weird shutter and ISO tagging. Some EXIF says that the photo was taken with 80000 or 160000 ISO. Is it relevant to ...
3
votes
2answers
254 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.
0
votes
1answer
83 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
votes
1answer
404 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 ...
37
votes
7answers
15k 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
votes
3answers
3k 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
votes
1answer
147 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
votes
3answers
148 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?
1
vote
2answers
577 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
votes
1answer
89 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
votes
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 ...
103
votes
5answers
8k 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
votes
2answers
202 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 ...
2
votes
4answers
959 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 ...
15
votes
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
votes
6answers
1k 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
vote
1answer
79 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
votes
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
votes
5answers
4k 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 ...
0
votes
2answers
217 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
votes
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 ...
27
votes
7answers
37k 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 ...
0
votes
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
votes
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"?
5
votes
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? ...
5
votes
1answer
258 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 ...
1
vote
2answers
132 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
vote
6answers
500 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
votes
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
614 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
votes
2answers
123 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
votes
2answers
306 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
votes
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?