Lense supports
What do you mean, lens support? - a 75-200 is not usually long enough to warrant this, if you mean a support bracket to mount the lens to a tripod, instead of a camera mounting point?
btw - sigma made all or most of the lenses for quantaray, so you might try looking this one up that way as well.
SOURCE: Quantary 100-300mm telephoto lense
I have been researching this problem and found there's nothing you can do. Appararently, the quantaray, being an older lens, wasn't made to work with this latest era of cameras. Though it might work perfectly with your older camera, its technology is outdated as it relates to digital cameras and can't mesh with the latest and greatest. By the way, most of my questions were answered on the Digital Camera Resource page (www.dcresource.com)
SOURCE: quantaray tech-10 24mm f2.8
I work for Ritz and just fixed this issue for a customer. The lens may not be fully seated into the mount and the contacts are not in alignment so there is no communication between the camera and the lens. Try turning the lens a bit more... gently... towards the locking position, you will here a click from the release button coming up all the way and the lens should start to work just fine.
SOURCE: Quantaray lenses
I bet they are not AF lenses. There are adapters that add the AF contacts to "fool" the camera but increase the zoom. You can get used lenses from many "on line" camera stores with warranties for a few months.
SOURCE: I´ve been trying to use my Quantaray 70-300
Canon leads the current world market in lenses with their L-series lenses using fluorite rather than other manufactures use of glass. however, they do not make money when we buy 'other' brands of lenses and have kept a certain amount of their body to lens, coding as propriatary. the problem you stated is a common complaint with all second manufactured lenses and the only real solution is to put a canon lens on a canon body.
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