I don't know why, but the fact that information on these things is scattered all over the place, often conflicting, and often confusing in that a lot of the times someone's description of the converter seems to not match what the converter itself has written on it, I started this thread. Not to mention the confusion here,
Pentax K-mount Teleconverters and Adapters - Lens Reviews and Specifications - SLR and Interchangeable Lenses - Pentax Lens Reviews & Lens Database
Forget the early converters that had no electrical contact pins or screw drive accommodations, and focus on the more modern versions. A list of which are...
2x KAX Teleplus MC (no screw drive, made by Kenko)
2x KAX Teleplus MC7 (no screw drive, made by Kenko, 7 element)
2x KAX Macro Teleplus MC7 (looks like a Vivitar helicoid with green lettering, no screw drive, 7 element)
Albinar ADG Auto 2x Tele-Converter KR (manual focus)
Bower MC7 2x Pz
CPC 2x Tele-Converter MC KAR
Digital Concepts 2x AF
Focal MC 2x Converter (no screw drive, another older version says the same but has no contacts)
Gemini Auto Teleconverter 2x (PKA) (no screw drive)
JC Penney 2x
Jessop Auto Teleconverter MC 2x (no screw drive)
Kalimar 2x Tele Converter KAR
Kenco 2x KAX Teleplus MC4 (no screw drive)
Kenko Pz-AF 2x Teleplus MC4 (no screw drive, 4 element)
Kenko Pz-AF 2x Teleplus MC7 (7 element)
Kenko Pz-AF 2x Teleplus MC7 DG (7 element)
Kenko Pz-AF 1.5x Teleplus SHQ
Kenko Pz-AF 1.7x Teleplus SHQ
Kenko Pz-AF 1.5x Teleplus MC DG (hunts forever without a lot of light on non FF camera)
Kenko P-AF 1.4x Teleplus MC4 DG (4 element)
Kenko P-AF 2x Teleplus MC4 DG (4 element)
Kenko P-AF 2x Teleplus MC7 DG (7 element)
Kiron MC7 2x Teleconverter (manual focus)
Kiron 2x Teleconverter for PA/RX (no screw drive)
HD Pentax-DA 1.4x AW AF Rear Converter (not FF)
http://us.ricoh-imaging.com/wp-content/uploads/2015/04/1394730000_DA_Rear_co...lity_Chart.pdf
SMC Pentax-F 1.7x (no screw drive but focuses FOR the lens, also focuses M/K lenses)
Pentax Rear Converter-A 1.4x-S (manual focus only, with no screw drive)
Pentax Rear Converter-A 1.4x-L (manual focus only, with no screw drive)
Pentax Rear Converter-A 2X-S (manual focus only, with no screw drive)
Pentax Rear Converter-A 2X-L (manual focus only, with no screw drive)
Phoenix AF 2x (no screw drive)
Pro Cambron 2X MC7 (7 element)
ProSpec Auto 2x Tele-Converter KR (no screw drive)
Promaster Spectrum 7 1.7x Teleconverter for Pentax Z AF
Promaster Spectrum 7 2x (no screw drive)
Promaster 2x Teleconverter for Pentax/Samsung
Quantaray 2x AF ("A" works, screw drive works, SDM ?)
Rokunar Auto 2x Tele-converter (no screw drive, 4 element)
Sakar 2x Tele Converter KAR (no screw drive)
Sears Auto 2x Tele Converter 4E/MC KR (4 element)
Sigma APO 1.4x EX
Sigma APO 1.4x EX DG (not for lenses other than Sigma brand)
Sigma AF Tele Converter X1.4
Sigma APO Tele Converter 2x EX
Sigma APO 2x EX DG
Soligor C/D4 AF Tele-Converter 1.7x
Soligor C/D4 Auto Tele-Converter DG P/AF (1.7x, no screw drive)
Takumar-A 2x Tele-Converter (no screw drive)
Tamron-F AF Tele-Converter 1.4x Pz-AF MC4 (4 element)
Tamron-F AF Tele-Converter 2x Pz-AF BBAR MC7 (7 element)
Tamron-F Tele-converter 2x KR MC4 (no screw drive, 4 element)
Tokina EL 2x Converter for P/KA (manual focus)
RMC Tokina Doubler for P/KA (no screw drive)
Vivitar Series 1 1.4x AF
Vivitar 2xMC4 AF (4 element)
Vivitar Series 1 2xMC7 AF (7 element)
Vivitar 2x Macro Focusing Teleconverter MC P/K-A R-P/K (no screw drive, blue lettering)
Vivitar 2x Macro Focusing Teleconverter MC P/K-A R-P/K (no screw drive, green lettering)
Vivitar MC Tele Converter 2x PK/A/R-PK (plastic mount, no screw drive)
I'm sure I missed some, so what are they? Please post any info you KNOW first hand about these things. Anybody collect these things?
Last edited by oscaletrains; 11-06-2016 at 06:38 PM.