Regarding input-referred read noise in electrons chart?

Started 4 months ago | Questions thread
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maboleth Contributing Member • Posts: 830
Regarding input-referred read noise in electrons chart?

I'm a complete rookie when it comes to this:

https://www.photonstophotos.net/Charts/RN_e.htm

When shooting deep space objects, untracked, I was advised to pick ISO that is evened out, close to "1" on that list, based on the chart of my camera. Now I'm not sure why, why does it matter to be close to 1 and not 0,5?

What I have noticed though is that newer cameras have much lower curve lines than older ones. For example, original Canon 5D has a curve so high it's not even close to 1. Yet my 90D or R6 have them closer to the 0.

Also - am I right to assume that I should pick ISO 1600 for Canon 90d, based on the chart above? Or 3200 could also do the trick without issues?

 maboleth's gear list:maboleth's gear list
Canon EOS 5D Mark IV Canon EOS 90D
ANSWER:
Canon EOS 90D
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