Originally posted by Greyser Pentax HD 1.4x AF TC is APS-C only. I haven't noticed that and just waisted $500.
I just throw it on the camera and shoot. Sometimes it vignettes a bit, sometimes it doesn't. I almost always get at least 30 MP out of those files and often when cropping 9x16, 3x4, or 4x5 I get the same Image I would have using an FF TC.
My whole swallow series above is shot with the 1.4 TC on the K-1. Vignetting? What vignetting?
Although from what I understand it's worse on some lenses than others. maybe I just got lucky in my lens selections. Honestly, my 18-135 vignettes just as bad on my K-3 from time to time.
I wouldn't use it on a landscape, but with wildlife, I'm going to be cropping much of the time in any case.