Okay, thanks to all the advisors on this topic here: learned a great deal and am now up and running with an adaptor that feels a bit flakey but seems to work.
Thought I'd post one of the first results, taken from my deck during a storm at dusk yesterday : this is 50 R Cron on 1DsIII and I have a 20 x 30" print drying as we speak. It looks pretty nice! F4, ISO 400, 1/1000th second and then cropped a bit.
T
wildbrooks-1.jpg