I fixed up a Pentax DSLR today - a Nikon D100 mounted on a Bellows K. It allowed me to take some shots with my FA* 600/4 and 1.4 XL at what looks like a focal length of 1260mm/f5.6. Follow the link below to see today's results.
http://www.photolin.com/600/thumb0001.htm -- John Mustarde www.photolin.com