One stop of ISO noise difference is imperceptible unless pixel peeping uncorrected raws in flat gray areas. The only time you need to worry about this is if you're underexposing to protect highlights. If your ISO is any higher than base ISO #1 when doing this, and you have to push exposure past where base ISO #2 would be, it'll look like dogshit compared to doing the same exposure push on a single gain stage sensor.
Pixel well capacity matters a lot more in everyday use. Smaller pixels retain colors less effectively with underexposure/high ISOs even though more, smaller pixels retain detail better leading to many a pixel peeper to claim high res cameras are not worse in low light (the total death of the reds and noticeable chroma noise blotches that are a bitch to edit out say otherwise). If you care about clean images, buy a camera with fewer, larger pixels and don't zoom in 200%.
>>44023981: ISO setting should be visible in auto ISO all the time or with a half press. changing whichever exposure parameter (ss/a/metering comp) you're willing to compromise on and using half press AEL allows indirect ISO control in auto ISO. Anyone coping about this probably has a zf (worst auto ISO controls on earth).
2: If you're shooting at base ISOs, you're protecting highlight data but deeper shadow tonality and color pushed up from underexposure actually looks slightly different than getting it right in camera for the same reason shooting at a higher ISO in camera can throw away highlight data, it's not really the exact same thing. The SNR tests are just extremely close to it being the same thing. It's best practice to compromise a little so you don't have to push the files too much. Especially on canons, and any sony raws that were shot with shading correction left on.
