I can't be much help, as my 6x7 300mm is sitting in my closet too. I found a good deal on a used 6x7->K mount adaptor, and also have a few K-mount Pentaxes. But I have not yet used the adaptor... though if I ever have a yen to use a 300mm lens (on either format), well, there they are. Unused versatility. I use my 6x7 gear quite a lot, but mostly with normal to wide lenses.
The K adaptor does not retain diaphragm automation, while I believe the 6x7->645 does. That adaptor could be useful in the event of a P645D. Mi Doug On 30/09/06, Paul Stenquist <[EMAIL PROTECTED]> wrote: > Has anyone tried this lens on a 35mm camera or a D? I have fond > memories of my SMC tak 300/4, but I sold it when I was raising money > for the D. I have the 6x7 lens, and I'm wondering if purchasing the K > adapter is worthwhile. I probably will keep my 6x7 kit for now, so > the lens is in my closet. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net

