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01-05-2012, 12:48 AM   #16
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So I finally acquired 'K' 85/1.8 and it is pretty compact lens. I didn't make enough photos with it to make any final conclusions on this lens. Comparing to DA70 I found K85 at least equal in terms of resolution when taking photos of the same scene. Actually it seems to me that K has slight edge over DA in centre sharpness in apertures below f4, while they are moreless equal beyond f4. They seem to perform evenly at the corners. DA has marginally advantage in contrast. Not a bad performance for 30+ years old lens, matching the modern design. Interestingly I once possessed FA77 and found DA70 to be a better lens, so I would take any 'fa77 blows K85 out of water' posts with reservations.

01-05-2012, 01:13 AM   #17

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I don't have the K, but I do have the M85/2 which is rated 'worst' of the Pentax 85mms and the FA*.
From my brief comparison of it against a FA77, it was its match in center sharpness wide open, so I'd expect the K version to be better.
Can't comment on CA resistance and hazing though as I did not stress test both lenses at that time.
The M85/2 is pretty bad at those 2.

Certainly no such thing as this lens blowing that out of the water.
The 77ltd is better if working space is a bit more limited of course.
01-05-2012, 04:01 AM   #18
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Just for interest here are tests of both K85mm and FA 77mm lenses.


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