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I have a Quantaray 100 ` 300 mm zoom bought at Ritz.
Zoom works great but the focus is jerky and sounds like it has 3 hard stops that you have to go past to focus correctly. Any idea how to fix this problem?
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Quantaray has made several different 70-300mm lenses so I'm not sure exactly which one you have. However, if the lens doesn't have a AF/M switch it's no big deal. Assuming it's an autofocus lens, it's always on. If you want to switch to manual focus, flip the switch on the camera body.
If it's an older manual-focus Quantaray lens then the question is moot.
You may have two options.
First, contact the place where you bought the lens from. Quantaray is mainly a Ritz Cameras brand.
Secondly, you can use third party repair shops.
I purchase some of my lenses from KEH. [keh.com].
They have a repair shop for cameras and lenses.
Attached is their FAQ site. http://www.keh.com/repair-center.aspx
If it's an older lens, for EOS film cameras, Quantaray might upgrade it free - contact your local Ritz Camera store ( it's imported by Ritz ) or find a repair center for Quantaray online.
Quantaray is a private label lens made for Ritz Camera. They make this lens to fit several different camera brands including Nikon and Canon. The only ones that will fit a Canon camera body are the ones with the Canon EOS mount. If your Quantaray lens doesn't have an EOS mount, then it won't work on your Canon camera. You can take the lens to any Ritz Camera location and they can help determine which mount it has, and which cameras it will fit.
There is no secret locking switch. If a little gentle jiggling doesn't free the zoom ring, then I can only suggest you take it in to a reputable camera shop for a Clean-Lubricate-Adjust (CLA).
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