07-08-2012, 07:48 AM
[quote name='Frank' timestamp='1341665208' post='19351']
The MTF chart looks much better than that in Lenstip. Does it reflect sample variance of Sigma, or mean Lenstip gets a bad copy?
[/quote]
Honestly: no idea. There are just too many variables, and of course we have no insight on the lenstip testing except the info they give on their web site. They decided to use a very different testing approach with no sharpening at all and that, as well as sample variation, might be the reason for their very different results. IN this and a few other cases, too.
-- Markus
The MTF chart looks much better than that in Lenstip. Does it reflect sample variance of Sigma, or mean Lenstip gets a bad copy?
[/quote]
Honestly: no idea. There are just too many variables, and of course we have no insight on the lenstip testing except the info they give on their web site. They decided to use a very different testing approach with no sharpening at all and that, as well as sample variation, might be the reason for their very different results. IN this and a few other cases, too.
-- Markus
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