snapsy Offline Upload & Sell: On
|
reggieb wrote:
If you have a higher ISO, less light was reaching the sensor, and the result is that you have to turn up gain to the sensor, which is a cause of noise in digital images, not the only cause, but one of them. I think your statement will just confuse people. There was less light that reached the sensor, regardless of ambient light level, if you're taking a picture of the same scene, with the 12,800 image and the 3,200 (assuming they're both exposed the same).
Sure, you could be causing less light to reach the sensor by cranking shutter speed, f/stop, or turning off the lights, but the result is the same. The increased gain causes increased noise, unless I horribly misunderstand the physics involved. ...Show more →
The takeaway from my post is that a higher ISO doesn't necessarily mean less light reached the sensor. For example, a high-key ISO 12,800 image might have the same amount of light reaching the sensor as a low-key ISO 3200 image. The noise levels of both will be very similar.
|