Light gathering in M43 vs FF

Wrong. I don't use 'ISO' and exposure is just what is. But what you said was 'Exposure compensation'. I don't use that. Never have.

Why would I use my 'equivalent formulas' to take a shot? Equivalence only comes into effect when you try to compare the picture taking abilities of two systems. So, I'd need to use equivalence to work out how to set the f-number for the DOF I wanted when using different formats. Other than that, if you are setting the f-number directly for the DOF you want, and the shutter speed for the motion blur you want, equivalence hardly comes into it, unless I wanted to ask myself 'if I was doing this on another format, to get the seam result, which f-number and ISO would I need to set', except of course, as above, I don't use ISO.

What I aim to do is determine the f-number and shutter speed for the pictorial effect (DOF motion blur) that I want. That determines the exposure and I don't set it any lower (except to ensure that the sensor isn't saturating).

OK.

This



and this



both taken from about 10 meters apart using the same ISO setting (100) and same f-number (2.8). Shutter speed different to avoid saturating the sensor.

--
Bob