| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
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Eric, you mentioned higher ISO, I think that is quite unrelated to digital zoom.
The advances in high ISO and related noise management utilise various techniques. In the past the signal from the sensor was amplified and therefor showed a very faint dark image more boldly and brightly, revealing shadow detail.
Modern cameras with extremely high ISO compared with what we remember, utilise additional processes because you can only go so far with amplification, noise sets in.
Think layering in PS, layer the same image ten times and use the add to multiply command. That is a technique used for astro photography which avoids long exposure and high ISO. What modern cameras are doing is effectively layering the image data instead of amplifying it.
I understand the threshold is about ISO 3,200 then this 'layering' process kicks in.
If you push the camera ISO too far, you limit what can be done in post process, the camera ISO boost is across the board, in post process you can just push the shadows, if the whole image has been pushed in camera, you may still have dark shadows with no latitude left for further adjustment, whereas if you push less in camera then you have more scope to just push the dark shadows in in post process (computer).
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Robert.