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10-01-2008, 08:16 AM   #1
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New SDM rear TC, SDM only or SDM + screw drive?

I may have missed it, but is the SDM rear TC SDM only or for both SDM + screw drive lenses?
I'd like one for all lenses, not one for each type of drive.

10-01-2008, 08:23 AM   #2
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the prototype has a screw drive shaft
i doubt it will have the "AF" functionality of the 1.7x extender with MF lenses
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