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EXC++ VIVITAR 2X MACRO 7 ELEMENT TELECONVERTER FOR PENTAX PK MOUNT – RecycledPhoto
Pentax 2X Takumar A Teleconverter, for Pentax K Mount at KEH Camera
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SMC Pentax-m 50mm 1.7 Lens With Tele Converter 2x Panagor / for Pentax K1000 KM ME Super Etc 35mm Analog Cameras - Etsy Denmark
Telesor Auto 2x TeleConverter (Pentax K-Mount) | eBay
Re: pentax 300mm f4 with 1.4 or 2x teleconverter possible ?: Pentax SLR Talk Forum: Digital Photography Review