Linked Questions

1
vote
2answers
451 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 ...
0
votes
1answer
503 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
vote
0answers
200 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 ...
0
votes
1answer
126 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 ...
-1
votes
1answer
102 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 ...
0
votes
1answer
78 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 ...
300
votes
16answers
57k views

Good examples of RAW's advantages over JPEG?

I'm curious to see some real examples of where simply capturing the same photo in RAW (and being processed by someone who can do it justice) has significantly improved the photo at the end of the ...
64
votes
27answers
3k views

What is something you learned recently about your gear that you wish you discovered earlier?

I'm playing with my old XTi with a new travel lens, Tamron 18-270mm and I'm reading the instruction sheet for the Tamron and read a section about Manual focusing and got to the small print. Even in ...
126
votes
7answers
15k 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?
44
votes
10answers
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 ...
35
votes
6answers
14k 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 amplification?...
32
votes
4answers
5k 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 ...
14
votes
6answers
6k views

Can you fix incorrect exposure during post processing?

If a photo is over or under exposed but not to the point of clipping (histogram does not reach the left or right side) is there any reason you couldn't just fix the exposure in Photoshop or Lightroom? ...
9
votes
3answers
5k 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 ...
15
votes
4answers
4k 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 ...

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