Originally posted by morfic Tell me how to make the graph unless you want me to drop you the (raw) files somewhere for you to download.
BTW, my screen won't be here for about 2 weeks, which is why i was hoping to get an answer with regard to AF accuracy in the mean time.
I used Excel obviously, with the Y axis for grey scale value, and X axis with F stop. The X axis is also plotted on a log scale so that the stops are uniformly spaced.
To get the grey scale value, at least in PSP X2, I just turn on the hystogram, and it has a check box for selection or whole picture, and another selection where it reports the average and mean value of what ever curve you want, greyscale, any of the colors etc. I select grey scale.
You can simply post a table of data, F Stop, and Grey scale value, for each lens and each screen. and you can also tell me what metering mode (matrix, spot etc.) I use spot for my tests.