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Forum: General Photography
08-29-2018, 02:13 PM
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Thanks for the explanation -- goes a long way to pulling this thread back towards answering the OP's question, and this one paragraph is a nice effective summary.
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Forum: General Photography
08-29-2018, 02:08 PM
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That's what I was getting at. Assuming that bracketing is not an option for whatever reason, if you know your camera is ISO-invariant, you can get away with that in a single shot. If the camera isn't, then you have to pick either protecting the highlights (low ISO and push) or less noise (high ISO). That's all there is to it.
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Forum: General Photography
08-29-2018, 12:07 PM
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Norm -- You seem to be coming at this from the angle of there being no advantage to shooting ISO 400 instead of ISO 100 pushed 2 stops. But no discussion of ISO invariance I've seen has ever argued otherwise.
Rather, the value of ISO invariance is supposed to be in being able to shoot at the lower ISOs and push without any noise penalty, so that you can retain any highlights that might have been lost (in the raw and not just the JPEG, because the ISO setting is (in most cameras?) effected via an analog gain stage) at higher ISOs.
This might not matter much to you or me shooting sunsets, where the highlights are critical and shadow detail is a nice-to-have. But I imagine this would be important to people shooting night scenes where much of the detail is in the shadows, so shadows are critical and unclipped highlights are a nice-to-have. Or maybe astrophotography?
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