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Forum: Pentax SLR Lens Discussion 12-27-2012, 12:29 PM  
Pentax DA 50mm/1.8 vs. FA 50mm/1.4 vs. F 50mm/1.7
Posted By lukelbd
Replies: 35
Views: 38,418
Well after more research I've only reinforced what I initially thought -- which is that the f/1.7 lens is sharper than the f/1.4 lens.

I'm not sure how so many people in this thread find the FA/1.4 to be better than the FA/1.7, but would urge posters to speak objectively rather than defensively and subjectively. Given the comparisons I found in the thread I linked above, and given the reviews I've found of the optics of the FA/1.4, I don't see how it would be possible that the FA/1.4 is "sharper." The photo posted above only reinforces this -- I see a failed attempt to compensate for very poor sharpness with software and terrible purple fringing. Also, lens hoods may increase contrast (which if post-processed is a non-issue), but certainly not sharpness.

And here are the reviews I found:
Pentax SMC-FA 50mm f/1.4 - Review / Lab Test Report - Analysis & Verdict
Pentax smc FA 50mm 1:1.4 review: Digital Photography Review

You'll notice that the reviews are perfectly consistent with each other. I know some people are going to have a problem with this, but I find it hard to believe after thousands of lens reviews that either dpreview or photozone are fundamentally screwing up their sharpness tests.



I had thought the F versions were the same optically as the FA; this is incorrect?



Yep, I've read the reviews of the Sigma 50mm. However for me, one of the biggest points of having a prime lens, aside from being fast and sharp, is that it should be small!
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