this is the lates and best Apo Digitar 210 mm. The older version was 6,8/ 210 mm. This is the latest 5,6/210 mm.
This is the longest Digital lenses that Schneider and Rodenstock ever made and can be also used at all digital cameras from Alpa, Cambo, Arca, Linhof ect...The 210 mm production stop now, so this lens will be difficult to get.
I used it very less on my Leaf Aptus 12 and the lens will outperform every 80 mln back.
even at 5,6 you get perfect sharpness and big image circle of 120 mm.
The lens can be used also on 4x5 inch film cameras and should also be usable for 5x7 inch.