Originally posted by Clinton It has arrived, it's condition is even better than what I expected from the photos. The only bit of oddness is that the lens reports 1.7 as wide open to the K-7, and at 1.8 it is ever so slightly stopped down from a visual inspection. I love the idea that this lens is secretly 1.7, but I doubt that is the case.
Yes, my copy does the same thing - that is, reports f1.7 wide-open. I didn't know that at f1.8 it is slightly stopped-down - I never bothered to check mine that closely. But I will say that wide-open (f1.7 or f1.8 - I don't remember which), my copy underexposes very slightly (maybe by 1/3 stop) compared to the other aperture settings.
Originally posted by Clinton Other than this little bug, the quality of this lens is simply surreal, and the DoF control... yummy. A few people I noted reported it as slightly soft wide open, but I'm not seeing that.
I agree with you here - while it gets even better when you stop down, it is by no means considered soft at wide-open. FWIW, my A*135 wide-open looks sharper when viewed at 100% than my FA*200/2.8 @2.8.
I'll also say that you'll find excuses to shoot with this lens, even when it is not the most convenient (in terms of weight and/or FL) to do so. Enjoy!