James Burris wrote on Thu, 13 Dec 2007 09:58:30 -0800 > Hello all, > > Can I use the Sigma APO 1.4x with this lens? What about the 1.7x? > Any > good 2x?
Which of the two FA* 300s are you referring to, the f4.5 or the f2.8? The Pentax F 1.7x TC will work admirably on both of these lenses. It's especially nice on the f2.8; low light AF can be a bit dicey with the f4.5 The Sigma EX 1.4x TC will fit without may mechanical interference but I've never used it on these lenses so I can't comment on its performance. I suspect that it would not be as good as the Pentax however. IMO there's no such thing as a good 2x TC except possibly for the Pentax A-S and -L versions. I've used both on the f2.8 with decent results. Regards, Jim -- 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.
