I'm presuming you mean this lens: https://www.pentaxforums.com/lensreviews/smc-pentax-da-50mm-f1.8.html
No expertise here, but it appears to be at least as good as the FA-50 f/1.4 on the K-3 (as well as the K10D & K20D).
I also tried it out on the K-1 and I can't see any noticeable vignetting. I have the "Crop" function in the K-1 set to *FF* so auto-crop is turned off. I'm getting a full frame image to look at.
The lens may have been designed for the APS-C, but it appears to cover full frame with no problem.
If it's not beat up, you got a "hella" good deal. On 12/10/2018 04:56:09, J.C. O'Connell wrote:
I just picked up the subject lens real cheap $55 shipped and I was wondering what the concensus is on th image quality with crop sensor bodies. tia J.C. O'Connell hifis...@gate.net ----------------------------------------------------- Using Opera's mail client: http://www.opera.com/mail/
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