The F55 was always 640/800 to me. 1250 Native ? Psshhh. 1600 was pushing it....It’s noise was so ugly....it got offensive very quickly.
I found that Venice falls of a similar cliff eventually...same signature noise....there’s something not very nice about that sony noise once it shows up... Alexa noise seems to be less....ugly.
JB
The Digital Bolex was literally calibrated to an internal camera temperature that raised the random thermal noise floor above the fixed pattern noise, so you never see it. The random noise has a very nice fine grain quality to it if you dial out some of the chroma noise. Balance it right there is more detail and texture in the noise floor as well as giving the image some life rather than getting that flat plastic look when overdone
