An APS-H-only thread

A brief look through all links finds me unable to locate a statement that the H Quattro is actually suitable for DC lenses. The H sensor size is 26.6 x 17.9mm, 32mm diagonal. The APS-C spec is 23.6-23.7mm x 15.6mm, 28mm diagonal. Actual Sigma DC lens image circles might or might not be bigger than 28mm of course, but 32mm without significant vignetting?

So it might be that the sd Quattro H is only good for DG lenses . .

At least with the H size the sensor die might not be stitched as would have likely been the case with a FF size.