Quote Originally Posted by Rudolf Karachun View Post
Remove ground glass, by unscrewing two metal holders. Install Fresnel lens first, with grounded side looking toward you, put ground glass on the top of the Fresnel exactly same way as it was before, screw back metal holders. The Shen-Hao has a special spot for the Fresnel lens. You will see how the Fresnel will fit in its place after the ground glass removed.

If you follow these directions the ground glass will be out of register with the film plane. When adding a fresnel to a back that didn't come with one, the fresnel must go between the ground glass and the photographer.