Okay so my new Rodenstock Macro 210 arrived and yesterday I picked this flower to try my hand an a close up. I must admit I really struggled in getting the focus, what I did in the end was set the bellows extension on my Chamonix 8x10 to 420mm and then pretty much had the lens nearly touching the flower, from there I just moved the camera back slowly while looking at the ground glass and bobs your uncle the flower came into focus.............i fine tuned it but to be honest I would move the bellows out 1 inch and back 2 inches and nothing really changed so took the picture and here it is.
Neil