Quote:
Originally Posted by Quintin
Also, as far as I'm aware, you won't find Image Stabilisers, USM motors, or similar technologies on third-party lenses. I'm guessing it's either a legal or a technical issue, or both.
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That is not correct. Sigma and Tamron have these features as well, they are just named differently (the names of the features are probably copyrighted). Things like VR (vibration reduction) and HSM (hyper sonic motor) are essentially the same thing as IS and USM.