http://www.youtube.com/watch?feature...;v=fdF3RG0DDYw
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Nice. It truly looks like they put a ton of care into their lens making. I know I've never been disappointed by their lenses that I own.
I respect them and thank them for getting me through the years before I went almost 100% Nikon glass (only because the Tokina and Sigma Fisheyes are better for the job than Nikon parts (360 immersive Panoramas and Nikon doesn't have AF 8mm fisheye yet)) and for the competition they offer Nikon and Canon to keep them honest (somewhat).
Great video, nicely produced...
I only own their 150-500mm- the glass isn't bad, the OS(VR) works well and the HSM(AFS)autofocus is quick, but the fit between the lens and camera body needs some work. No reason for there to be any play in it like there is. The focus errors this causes when I forget to twist the play out are annoying. But, that's what I get with a 3rd-party lens.