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next PZ lens test report: Canon EF 20mm f/2.8 USM
#5
[quote name='Klaus' timestamp='1350978227' post='20686']

That is the nature of field curvature. Interestingly it (the field curvature) gets worse the more you stop down thus resulting in this roller-coaster ride.

[/quote]

Yeah, I'm pretty sure this isn't a normal behavior... SLRGear review was pretty much in line with your findings and they specifically mentioned field curvature:

http://slrgear.com/reviews/showproduct.p.../80/cat/10

Interestingly, their graph shows the lens sharpness to decrease slightly when going from f/5.6 to f/8, though it's nowhere near as wicked as what you've found.
  


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next PZ lens test report: Canon EF 20mm f/2.8 USM - by Rover - 10-23-2012, 04:00 PM

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