There is (or was) a Vivitar macro 2x TC in both PK and PKA versions. You attach a 50mm lens and you get a 1:1 100mm macro lens. I once saw a comparison between this set up with a Pentax 50mm f/1.4 and the Pentax F (or maybe FA) 100mm f/2.8 macro and the images were practically indistinguishable.
Here is the review page on PF: http://www.pentaxforums.com/userreviews/vivitar-2x-macro-focusing-teleconvertor.html Is this what you're looking for, Colin? Cheers, —M. \/\/o/\/\ --> http://WorldOfMiserere.com http://EnticingTheLight.com A Quest for Photographic Enlightenment On 6 December 2012 12:02, Collin Brendemuehl <coll...@brendemuehl.net> wrote: > Is there a helicoid extension tube with "A" contacts? > Or > Is there a helicoid 1.4x or 1.7x tc with "A" contacts? > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
