On Oct 2, 2013, at 3:18 AM, Darren Addy <pixelsmi...@gmail.com> wrote:
> The introduction of IF allowed Pentax to use a smaller > diameter front lens group (the F* 300mm f4.5 is 67mm filter size > instead of the M* & A* 77mm size) It also helps that the F* is half a stop slower than the M*/A* lenses :) Cheers, Dave -- 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.
