We need mirrorless cameras where ISO does not affect the EVF brightness (or focus) while still showing usable histograms.
April 10, 2023
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People have been trying to do magic with triangles since at least the time of Pythagoras.
Don Cox -
Right OOC, the JPEGs at the higher ISO settings will have more visible noise, because they are brighter and that makes the noise easier to see. Normalize the brightness, and photon noise becomes equally visible, and read noise might be a little bit less visible in the higher ISOs (depending on the camera and specific ISO settings).
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I would say that the change in brightness is more relevant than the increase in visible noise.
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What gets me is that the camera has all the information necessary make a better estimate than all but the most expert. The clipping point is known, as is the read noise profile. If the image sensor is being used for metering, it knows the highlight exposures. Even when it's OOC JPEGs the camera has all the exposure information and can use tha same algorithms to place18% appropriately. Really there's no need for the photographer to be guessing exposure at all.
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This is the big problem with these discussions. One person uses "ISO" to refer to the setting on the camera with that number, and another uses it as "ISO exposure index" shortened to "ISO", which is just a way of enumerating the exposure of a middle-grey object. No matter how many times this distinction is made, most people rush right back to using "ISO" without context or qualification. It needs to be qualified in every context; not once in a poster's life history.
If two different words were used for these two different things, we'd have a lot less to talk about, wouldn't we?
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It may or it may not, depending on the camera and ISO setting.
There is no requirement, whatsoever, that ISO 102K has more analog gain than ISO 50. None.
However, it is advantageous to use more analog gain (at the earliest stage possible in the signal chain), because there will be less read noise. You do not have to minimize read noise to legitimize a high ISO setting.
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D'accord
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As I think I said earlier, you have a different conversion with a beginner who is shootings SOOC JPEGs than you have with one who is making raw captures. For raw captures, ISO just isn't that important, unless you get clipping.
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We need mirrorless cameras where ISO does not affect the EVF brightness (or focus) while still showing usable raw histograms.
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Yes. If the camera computes the histogram before the EVF stream, it could also be a raw histogram.
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Duplicate?
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thats not base iso but extended. so its digital gain not analog.
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Likely both.
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Lets all agree to change the name to "exposure circle" 😁
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That article almost makes sense to me. I didn't understand this bit:
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I think it's just that the same camera could achieve -5EV+f/2 and -6EV+f/1.4, since each change represents a halving+doubling, so a camera which requires f/1.2 at -6EV is a bit worse in the comparison.
Sherm
