08-07-2012, 11:27 AM
While I still haven't used my 120-300 OS all that much yet, I haven't run into any issues with flare yet. Certainly nothing to suggest it is as bad as the worst lens I've used in that regard, the 70-300 DO. Also from my limited use, wide open is slightly soft with the Sigma 1.4x or 2x fitted, but all improve noticeably one stop down where it is decent.
I also had the old Canon 300mm f/2.8 non-IS previously, and for reasons I never understood the vignetting on that was unusually bad on crop sensor. I think overall the image quality is a bit better wide open, with or without TC.
I also had the old Canon 300mm f/2.8 non-IS previously, and for reasons I never understood the vignetting on that was unusually bad on crop sensor. I think overall the image quality is a bit better wide open, with or without TC.
<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.