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Dear Sir:

as mentioned in my initial reply, useable DR depends on may aspects, both personal (noise tolerance) and output type/size (larger prints are less tolerant to noise because on small prints values are averaged, so noise is less).

So, any specific value suggestion are incorrect because specific subjective (personal) and objective restrictions are not taken into account.

Meanwhile, 10.5EV @ISO200 looks ok (for me!) for A7III (assuming it is more or less the same as my A7R-III). I mostly do not use high ISO values on any camera, so could not suggest anything for higher ISOs (I use 6-7EV for ISO 1600 point, but this value is rarely used in my real culling, because used ISO range is mostly limited to 100,200, 640).