• Welcome to Photrio!
    Registration is fast and free. Join today to unlock search, see fewer ads, and access all forum features.
    Click here to sign up

Is there a 90 degree viewer for the Crown Graphic back?

The Cambo T-20/T-21 is probably the closest thing that is relatively easily adaptable with some DIY.
 
Ed, the T-20 is an in-line viewer. T-21, monocular reflex. C-288, binocular reflex.

People have adapted the MP-4 right angle viewer to a variety of cameras. Relatively inexpensive, relatively easy to find. I didn't suggest it frivolously.
 
A couple of the Wista ones for their wood field cameras mount by gluing them to the camera back. They come with a very strong tube of Japanese contact cement. They could probably be adapted to your camera.