How to determine the best exposure for raw files

I was using Canon R5 recently. With the same exposure, at ISO 200 setting the noise in shadows was worse than at ISO 100. Raw files become fully manageable at ISO 800.

Which aren’t? While most sensors are more invariant beyond the dual-gain threshold overall, I would still consider them “largely” invariant (at least the ones I’m familiar with). If you require maximum DR, using an ISO setting below the dual-gain point in very low light can still be of great benefit.

Sorry, I decline to answer the rhetorical questions.

In your OP, you said that AFTER exposure settings are decided, the NEXT decision shall be about nominal ISO settings to dial in.

now you argue that you decide about a nominal ISO EVEN BEFORE deciding about exact exposure parameters.

I do hope that beginners will understand WHY these opposing statements were made ...

Pentax K-3 III and Pentax K-1 II:
www.photonstophotos.net/Charts/RN_e.htm#Pentax%20K-1%20II_14,Pentax%20K-3%20III_14

they are either invariant or not - and in practical terms dual gain sensors sufficiently not invariant - unless you start to narrow things down to : oh,yes - between these 2 nominal settings ISO1600 and ISO3200 they are, thus excluding away parts that not suit you ... come on

You are correct. the radical got lost in translation. I've notified Lensrentals.

Thanks.

The Lensrentals folks left out the radical. Here's what it is supposed to look like:

I've notified them and hopefully they'll fix it soon.

you check BClaff site for a start (unless you can DIY the same) and then you test yourself though raw conversion - because graphs might still lie to you apparently ( see @IliahBorg about R5)

Thanks. I've asked them to make the change.

Set it at base ISO with an ETTR exposure if you can.

If you want to lower read noise, have a brighter finder image, or avoid extreme pushes in your raw developer, raise it a bit, but don't get greedy and run the risk of highlight clipping. The details depend on your camera.

they are not opposing

in an ideal scenario, when I have time/etc, I will decide AFTER ... but in a practical case I do decide BEFORE ( because I might not have time to decide precisely - so for example I select a certain Auto ISO before I start using M mode ) ... ISO not part of exposure ( process, from when exposure of a photo-site/sensel starts till that exposure ends ), but knowing how it affects the raw files (and raw processing using your specific raw converter and not abstract ideal something) becoming a part of your decision about exposure parameters to dial in ( aperture, exposure time and if you control the light, like strobes/etc - that too ) ... in that sense "ISO" still hangs around "exposure"

I don't' use auto ISO, but in the past seven or eight years I have not been in a situation where I picked my exposure based on the ISO setting I wanted to use.

I use Auto ISO and I select it once before moving to shot in M mode during some party time where I am also a part of that fun ( because I rather not fond of selecting like 2nd base ISO and pushing in raw converter or something along the lines ) - in that sense I am picking my exposure AFTER I decided about a nominal ISO ( that is I set limits for a camera to assist me and decide about the exact nominal ISO value within said limits understanding that it might not be all ideal and yes I might adjust some exposure parameters - but not auto ISO limits because that is way suits me - with what I like to do later w/ raw files in raw conversion ) - does not mean "based" on it the sense I feel you want to put in it

and if I move to use a strobe in middle because my friends want to have some posed photos under a good light then I do decide to use either a 1st base ISO or 2nd base ISO and that's it.... I will change aperture ( to get more or less people/faces/etc in DOF ), but not ISO - that I decide before based on the idea how much illumination I can deliver, etc ... so I do not change a nominal ISO after adjusting aperture/power output etc ... it is practical situation... does not matter that I agree w/ all ISO not part of exposure - it is just the way it goes in the real life

who said they havnt ? all cameras histograms are calibrated on the safe side of clipping thats all. plug a field monitor into your camera and see what a very detailed histogram looks like compared to say raw digger. on my sony a74 you can calibrate the cameras metering system and also the histogram/blinkies clipping warnings. been there done that and reset the camera back to default settings for 1/3 stop head room.

Safe side - like minus one and more stops?
www.fastrawviewer.com/culling-raw-vs-jpegs

Because they haven't.