Verified answer

Quantaray lenses are brands sold by Wolf Camera and Ritz Camera when they were making deals on cameras such as Canon and Nikon. They would add the Q lens, which cost them less and give them a bit more profit on the lens.

The lens will do the job and if you take care of it and don't knock it around, it will last. I was told by a long time manager at Wolf's that they were made by Tamron and Sigma, back and forth, depending on who go the contract to make them..