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Comparing macro lenses using MTF - part III - 0.66x
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Lou Jost



Joined: 04 Sep 2015
Posts: 2774
Location: Ecuador

PostPosted: Thu Sep 13, 2018 6:38 pm    Post subject: Reply with quote

Thanks Rik for that. I wasn't thinking properly.
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ray_parkhurst



Joined: 20 Nov 2010
Posts: 1708
Location: Santa Clara, CA, USA

PostPosted: Sun Sep 16, 2018 5:39 pm    Post subject: Reply with quote

I did a quick check of the 75ARD2 for CA using a resolution target at 2x. Here it is focused high, critically-focused, and focused low. The focused-high image shows red fringing, while focused-low shows green fringing. Looks like it resolves Group 7 #3 and almost #4, but I think that may be sensor limitations. These were shot wide open f4.5.





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