TaDa wrote in post #15563463
Pretty sure Roger (and other lens rental companies) have quite a few Sigmas, and quality control is their number 1 issue.
From Roger regarding the sigma 85:
Please note: This is an f/1.4 aperture lens. It will probably require autofocus microadjustment on your camera to give you sharp images wide open. If your camera does not have that feature, or you are not comfortable using it, please don’t rent this lens. If you are not used to working with wide-aperture lenses, please read this link before deciding if this is a good choice for you.
I’ve only done “around the shop” testing and shooting with this one, but that’s enough to say it’s quite a sharp lens and autofocuses quickly—quicker than the Canon 85 f/1.2 by a good bit and about as fast as the 85 f/1.8. It has a tendency to front focus pretty consistently on a number of bodies (not badly and it’s consistent). It doesn’t seem to change much with focus distance or aperture, unlike some other lenses that can drive you crazy. But because we’ve noted it, we recommend that this lens be used on cameras that have microfocus adjustment so you can correct for it (and that you actually use the microfocus adjustment feature before rolling out with this lens). Given that, it looks like a winner!
I wouldn't ever buy a lens as fast as the 85L, sigma 85, or 135L if I couldn't micro adjust them, as almost every fast lens I've ever used has required some MFA. Also, I think that you were an outlier with sigma's support. Most of the stories I've heard about their support said that sigma had their lenses a week, some rare cases were 2 weeks, and some were even less than that.