Quote Originally Posted by Tin Can View Post
Does that combo allow the wide open 420 aperture to be unobstructed?

I have my 420 coming and have Sinar shutter


Sinar Norma 420mm Rodenstock Imagon Homemade Board by Nokton48, on Flickr

Here's my 420mm Rodenstock Imagon. My Clockmaker friend made the homemade "forward mounting with the appropriate spacing, looks like held together with JB Weld. This is a big lightweight lens; the flange is bigger than the board itself. The Norma Shutter diameter is about 84mm across. The rear cell on this Big Baby is about 94mm across. So the rear cell diameter is bigger than the Norma Shutter diameter.I've used this for 8x10 B&W headshots and it is outstanding. Wish I had more than just the H5.8-H7.7 disk. I'd like to have some custom 3D printed. That would be a real service.

Might just be me but I've never seen anything on a 480mm Imagon.