On the less expensive side of the show, I have started using a Pentax-M 200mm F4 for 'up-river' looking photos etc. I haven't enlarged the negatives yet but combined with a red 25 filter the negatives look good. It is difficult to have everything in focus though even with f22 with tree branches/rocks being well outside the hyper-focal distance.
I'll ty and remember to post these here when I get them printed.
EDIT: Oooops I was refering to 35mm use and didn't realise this was a MF thread. It still applies though.