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Message: <blockquote data-quote="Kevin Purcell" data-source="post: 1388407" data-attributes="member: 68323">Interesting result, Steve.I've noticed that some of my older tests (that worked fine on lesser bins) like sharpness seems pretty silly for the "Chinese ED" bins because they don't distinguish between the bins (or other alpha bins like the Zeiss FL).It seems that when you get to this level you have to start changing tests that focus interest to more subtle features (and often more subjective features) like brightness/transmission, contrast, color saturation, CA (on and off-axis) and the like.I'm finding that these ED bins are changing the way I do the evaluations.The other thing I've found with the ZR ED 8x and 10x is that there isn't a significant difference is optical quality of the view (brightness, contrast, color saturation: all those things that seem to drop off in lesser bins). I've been really happy birding with the ZR ED 10x.</blockquote>