I'm going to be doing a review of the Hartblei camera and as they say, the Zeiss 100mm f/2 and 85mm 1.4 work as well as the 8-15mm, 17mm tilt, and 24mm tilt with their H1 camera, so, i was wondering what allows these lenses to do this versus other lenses....and I understand the image circle is the determining factor...thanks,