This was a lazy effort! I didn't get the 600mm out (with its need for careful support) but used my 6x7 300mm f4 EDIF plus 645A 1.4x converter - paired with the 645Z. As a result, a very heavy crop was required!
[IMG]_IMG4636Step7sRGBSMALL by Ed Hurst, Spiffing Pics (210k+ views - thanks!), on Flickr[/IMG]