Linked Questions

15
votes
4answers
5k views

Why is sensor sensitivity called "ISO"?

I was curious to know how the term "ISO" was coined for referring the image sensor's sensitivity. Is there any reason or circumstance that contributed for terming "ISO"? Also, does ISO has a literal ...
4
votes
4answers
1k views

Is higher ISO noise evenly distributed, or does it affect colors differently?

It's obvious that higher ISO affects the photograph by adding noise or grains. But will that grain or noise be distributed equally over all parts of the photograph, or will it specifically affect ...
9
votes
3answers
8k views

How does a film camera perform exposure compensation?

I have a Nikon D3x, a Nikon F6 and a Nikon F3/T. It is my understanding that, on a digital camera, "exposure compensation" actually alters signal amplification, similar but not identical to changing ...
9
votes
3answers
1k views

Variable ISO Sensor: Possible and/or Useful?

This answer to the question about how ISO is implemented in digital cameras seems to imply that each photosite (i.e., pixel) can have its ISO set independently. If this is true, then I would think ...
7
votes
2answers
1k 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 ...
5
votes
2answers
1k views

Does changing the ISO of a modern digital camera really change the gain of an electronic amplifier?

The question Why would using higher ISO and faster shutter speed yield more noise than using lower ISO and slower shutter speed? currently has five answers, and four of them contain the word amplify ...
2
votes
2answers
437 views

Where can I learn the theory behind photography and camera engineering?

While I do have a basic understanding of the concepts of photography, it would be great to also understand the theoretical background behind the optics and the engineering of modern cameras. E.g. to ...
1
vote
2answers
517 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 ...
6
votes
1answer
8k views

How can I find my camera's native ISO?

I understand the concept of native ISO, and prefer to shoot the closest possible to my camera's native ISO. However, from my understanding, a given camera's native ISO can vary between 100 and 200, ...
0
votes
1answer
87 views

Is the following video explaining ISO accurate? [duplicate]

So, I was searching for the exact mechanism behind the workings of ISO (or film speed) in digital camera. I found this video and it was pretty simple. But i was wondering if this video is accurate and ...
0
votes
1answer
172 views

How does digital ISO work electronically? One amplifier or many? [duplicate]

As I understand the way ISO boosting works in a digital sensor, is that the voltage coming from each pixel is boosted (or suppressed) by an analog amplifier. So, for example, if the native sensitivity ...
0
votes
1answer
653 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 ...
-1
votes
1answer
111 views

Gain Factors and Dynamic Ranges of Digital Cameras [duplicate]

I am a student working on a construction method for under sampled images. I am looking for a group of text books, papers, or web sites that would give me further understanding on how digital cameras ...
-4
votes
1answer
294 views

Why do digital cameras not have an iso rating? [duplicate]

With conventional cameras your camera had a maximum shutter speed ( typically 1600 ), and the film you used had an ISO speed rating at which it was meant to be able to get a proper exposure under "...
1
vote
0answers
226 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 ...

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