06-08-2021, 06:35 AM
(This post was last modified: 06-08-2021, 06:37 AM by Brightcolours.)
There is very little difference with higher ISO performance between the latest Sony APS-C camera (A6600), the Canon EOS 90D, and the Nikon D500.
If you want the best higher ISO performance, you need to look at the new and very expensive Pentax K3 III. It outperforms the rest by very smart noise reduction in the electronics themselves.
But you could also look at better noise reduction in post processing.
FF gives better high ISO performance in general, because the sensor is bigger. This also means you get less reach (no sensor based crop) and more shallow DOF at the same aperture.
MTF performs less than APS-C.
You do not need the best rain protection for bird images, as you do not go out to photograph them in the rain. And while transporting equipment in the rain, the camera bag is the protection. And yes, the Tamron 150-600mm G2 also works the same on a Canon 90D, for example.
Those are the basic rules, and you seem to overcomplicate things a lot, resulting in running around in circles.
If you want the best higher ISO performance, you need to look at the new and very expensive Pentax K3 III. It outperforms the rest by very smart noise reduction in the electronics themselves.
But you could also look at better noise reduction in post processing.
FF gives better high ISO performance in general, because the sensor is bigger. This also means you get less reach (no sensor based crop) and more shallow DOF at the same aperture.
MTF performs less than APS-C.
You do not need the best rain protection for bird images, as you do not go out to photograph them in the rain. And while transporting equipment in the rain, the camera bag is the protection. And yes, the Tamron 150-600mm G2 also works the same on a Canon 90D, for example.
Those are the basic rules, and you seem to overcomplicate things a lot, resulting in running around in circles.