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05-11-2014, 12:12 PM   #16
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zoolander
I'm having an issue. I did a little sharpness test with my 18-55mm and Pentax FA 50mm f/1.4. I didn't see a lot of difference between two lenses at what I believe is their sharpest F-stop (5.6). The FA 50 1.4 tested a lot sharper on Photozone compared to the 18-135.

I remember reading somewhere that the K-5 can inhibit sharp lenses due to the anti-aliasing filter being quite strong.

So perhaps even buying more expensive lenses there'll be a "glass ceiling" (pardon the pun) to sharpness, because of the AA filter ......

Is this the case ? Or am I in error ?

Did you check the image size? 55mm is 10% bigger than 50mm. The FA 50mm would need about 10% better resolution to equal the sharpness of the 18-55mm at 55mm.

dsturgis

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