I'm thinking of picking up a Sigma 2.0X Teleconverter EX DG APO for use with my Sigma 70-200 f2.8 APO DG HSM lens & my Sony A700 camera. According to the Sigma website the teleconverter should be compatable with this setup. My A700 serial number is lower than 5000001. Has anyone here used this combo, and if so how did it perform?
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