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General Photography
Balancing Exposure and Processing
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<blockquote data-quote="J-see" data-source="post: 406621" data-attributes="member: 31330"><p>I'm exploring that unknown world between the analog signal of the sensor and the digital conversion that is our RAW.</p><p></p><p>Remember, this is only when I can't increase my exposure by either lowering shutter or opening up the lens.</p><p></p><p>ISO decides how much the analog signal is amplified. There isn't much technical information out there so it's guesswork and then experimenting to check if the results match the guess.</p><p></p><p>What I think goes on is that at the native ISO the analog signal is converted at something like a 1:1 ratio. Each stop of ISO changes that conversion and multiplies it. ISO 200 would be a 1:2, 400 a 1:4.</p><p></p><p>The problem with this is that it too multiplies all noise which is clearly visible when we shoot high ISO. This is purely the result of this change. Another negative side effect is it lowering our quality.</p><p></p><p>What I'm experimenting with is skipping the amplification by only using the native ISO and manually adjust my exposure afterwards in post. The reason for doing so is that my RAW file contains the purest signal my cam could grab while using a specific A and S during those light conditions. It is exactly the same signal the higher ISO used but since I am not changing my conversion ratio, I am also not affecting my quality. My dynamic range will be larger and the colors better at the price of a little more work in post.</p><p></p><p>I don't know if it works for all cams. If your cam's amplifier results into a better signal than the adjustment in the RAW editor, using ISO is the better choice. But if you can do better in post than what the cam does, don't use ISO, preserve all quality and adjust to your liking in post.</p><p></p><p>That's all there is to my current approach to shooting RAW.</p></blockquote><p></p>
[QUOTE="J-see, post: 406621, member: 31330"] I'm exploring that unknown world between the analog signal of the sensor and the digital conversion that is our RAW. Remember, this is only when I can't increase my exposure by either lowering shutter or opening up the lens. ISO decides how much the analog signal is amplified. There isn't much technical information out there so it's guesswork and then experimenting to check if the results match the guess. What I think goes on is that at the native ISO the analog signal is converted at something like a 1:1 ratio. Each stop of ISO changes that conversion and multiplies it. ISO 200 would be a 1:2, 400 a 1:4. The problem with this is that it too multiplies all noise which is clearly visible when we shoot high ISO. This is purely the result of this change. Another negative side effect is it lowering our quality. What I'm experimenting with is skipping the amplification by only using the native ISO and manually adjust my exposure afterwards in post. The reason for doing so is that my RAW file contains the purest signal my cam could grab while using a specific A and S during those light conditions. It is exactly the same signal the higher ISO used but since I am not changing my conversion ratio, I am also not affecting my quality. My dynamic range will be larger and the colors better at the price of a little more work in post. I don't know if it works for all cams. If your cam's amplifier results into a better signal than the adjustment in the RAW editor, using ISO is the better choice. But if you can do better in post than what the cam does, don't use ISO, preserve all quality and adjust to your liking in post. That's all there is to my current approach to shooting RAW. [/QUOTE]
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