The P67 600/4 is a very old design. Apart from being hugely heavy it is also notorious for chromatic aberration unless well stopped down. The P67 800/4 is the same as the 600 but bigger and is difficult to find while the 800/6.7 is pricey. The 500/5.6 can be had below $1k on a good day and is newer than the K500/4.5 so is probably the best option. I don't know anything about the 645 lenses but would expect them to be modern designs and worth looking at.
Paul Ewins Melbourne, Australi On 26/04/2013, at 6:25 AM, Stan Halpin <[email protected]> wrote: > I have noticed that used lenses in longer focal lengths (e.g., 600mm) are > more available and with more manageable prices in Pentax 67 mounts than > K-mount. I know it is feasible to use the 67 (or 645) lenses on my K-5ii with > adapter. I would imagine at that point I would have a totally manual lens > which might be worth it if the image quality were good enough. > > So, does anyone here have experience using the 600mm or other 67 lens on a > K-mount? Particularly on a recent body like K-20D, K-7, K-5 . . .? > > stan > -- > PDML Pentax-Discuss Mail List > [email protected] > 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 [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
