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This extender is great for use with the Sigma EX 120-300mm f2.8-OS-HSM, it does not degrade the image or alter the AF. I use it only on digital cameras with Sigma lenses. I personally believe it works better on the Sigmas than the Canon 2xIII. I also used it with the Sigma EX 70-200mmf2.8 OS and the Sigma 100-300/4 EX HSM with good results. It is very rare that a 2X TC behave like this, but on the 120-300/2.8, it is a must.
I could not get a spot meter with a 500mm sigma and this sigma 2x-but I definitely got a center meter with the auto-focus--a light meter is important because of the crop factor at long range etc. The spot meter would be nice-but at 1000mm that's asking alot--no other 2x extender would give a light meter at that range--maybe at 700mm or 600mm, not a 1000mm---I've tried the other 2x's, like the vivitar 2x and the auto focus meter range was not even close to the sigma 2x. The canon af 2x does not apply because of the "fit" factors with their 2x's.
Good product, extends reach if my sigma lens
Verified purchase: Yes | Condition: Pre-owned
All I can say is it works like it is suppose to....
Verified purchase: Yes | Condition: Pre-owned
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