Apo Rodagons are process lenses. The ones I've seen are in barrel with adjustable fstop starting at f5.6. My data says they are corrected between 1:3 and 3:1. Not good for the magnifications you want. I use a 240 as my enlarging lens for large format. But "normal" size prints.

Quote Originally Posted by Old-N-Feeble View Post
I found a 300mm Apo Rodagon in an obscure little shop here but it doesn't look anything like the enlarging lens. It has a fixed aperture of f/7 and is in a straight barrel with a flange at the rear. It appears to be multi-coated. Any idea what this is?