Originally posted by tim60 Your Flickr page says GX10. To be sure, is that APS.C format? I had been wondering how this lens works on the crop format. Do you have other examples to post?
Yes, the GX-10 is APS-C. I haven't got a full-frame DSLR to try the 17mm on, but I did play around with it on a Spotmatic and the field of view really did look like 180 degrees, with a very definite fisheye effect. On APS-C it has about the same field of view as I guess a 14mm rectilinear, with much less of an obvious fisheye effect, and it de-fishes very well using PT Lens. The shot on the previous page is de-fished.
I posted some first test shots back on page 1009 of the Takumar Club, which you can see full screen if you click through to Flickr. But this one was my first "real" photo with the lens. More will hopefully follow.
I think you have to be willing to accept the 17mm for what it is: a 50 year old design that has some real weaknesses and some unique strengths. I've also got a Zenitar 16mm fisheye, which is a lot cheaper, a stop faster, and much sharper at wider apertures, but with much more boring colour rendering. You have to stop the Takumar down to at least f/11 and preferably f/16 to get good sharpness across the frame even on APS-C. But what you get from the 17mm that you can't get from any other lens in existence is the Takumar rendering, and for me that trumps all other considerations. It's a joy to shoot with.
(Top tip: the clamp-on round hood for the original Super Takumar 28mm with the 58mm filter ring works perfectly as a hood for the 17mm on APS-C without vignetting.)