12-03-2015, 08:04 PM
Quote:There is nothing in my view, which prevents publishing all four bars - unless each bar requires a significant amount of your work (as opossed to scripts extracting the figures from the imatest and producing the input data for the plot program). Never played with imatest myselft so I don't know that one.
By the way, did you ever play with the 40 MP mode of the Oly E-M5ii? Do you get similar to that Canon when using a top lens of that system?
+1 for including both Center and Near-center (off-center?) along with Corners....and dropping extreme corners.
Always found the Extreme Corners mostly useless data but also misleading...as has been discussed periodically in these forums. Extreme corners seems to be a legacy of testing FF coverage lenses on low-res APS-C sensors and trying to force data to find some minor differences among lens-sensor combos that all performed similarly. Consequently, Extreme corner data is over-weighted at PZ.
I've never had a photo where I ever needed any performance out of the extreme corner. It's such a small area of the photo, but given far too much importance by PZ. I always ignore the results from it.
Meanwhile, there is no data from the truly important golden-ratio / rule-of-thirds parts of the frame.
Center / Off-Center / Corners provide much more useful spread of data across the frame. Also avoids the perception of such extreme drop-off that you are currently getting with high-res sensors for Center / Corner / Extreme Corners.
Thanks for considering my input.
/Dave
http://dave9t5.zenfolio.com
http://dave9t5.zenfolio.com