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For sale in separate auctions ending Sunday.
Promaster is autofocus.
eBay: Promaster 1.7X Teleconverter for Pentax Autofocus (item 110110196964 end time Apr-08-07 16:45:15 PDT)
Vivitar is the KA version.
eBay: Vivitar 2X Macro Focus Teleconverter for Pentax K-A (item 110110194299 end time Apr-08-07 16:35:35 PDT)