Originally posted by Christine Tham I have just taken a number of shots, all on the FA43, f1.9, ISO100
You should have clarified (as you did in another post) that you allowed the AF assist to come on in some occasions.
Originally posted by falconeye I plan to redo the FA 31 f/1.8 1m test with enough points in the chart to see an effect.
Great, looking forward to your findings.
Do you think it might perhaps be good to get some data with the old firmware regarding the potential peak of defocus around EV 8? Remember that you posted that you had
no data for tungsten around EV6 to EV8?
Not trying to generate more work for you but it might be interesting to check what the state with respect that issue is. Potentially studio shooters experiencing FF problems might have just used slow lenses, but as your data was compatible with a potential EV6-EV8 problem and your slowest lens seems to have been a f/4, it might be worth checking out.
Your report doesn't seem to allow checking whether the EV8 hump is produced by your slowest lens only, but even if that were the case, the EV value seems to be too high to be explained by the colorimetric sensor failure theory.
P.S.: Someone send me a K-5 so that I can help with the testing.