02-09-2012, 01:07 PM
My APS-C Samyang 8mm fisheye distance scale was way out of whack too. Focusing at infinity, the scale was showing 0.7m. Not even close. I couldn't reach the specified MFD either. Only later I found out you can undo some screws and re-align the focus ring, which I did. Infinity was now at infinity, and I could finally reach MFD.
Bear in mind the very short focal length of the lens, I suspect it is far more sensitive to extension effects than most other lenses. If the mount is even a fraction of a mm off, that could cause a very significant focus shift.
Bear in mind the very short focal length of the lens, I suspect it is far more sensitive to extension effects than most other lenses. If the mount is even a fraction of a mm off, that could cause a very significant focus shift.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.