Postby Walter Glover » 12 Sep 2012, 10:17
Alastair,
The thing to do is to focus critically with your widest lens wide-open and a reasonable distant subject and shoot a sheet of film. Process it and check the sharpness of the image. As I pointed out to you when we met, the ONLY critical dimension in LF photography is the distance from the front of the ground glass holder where it makes contact with the camera body and the plane of the ground-glass which must be in the same plane as the sheet of film.
If the image forming ground surface of the ground-glass is at the very front of the Yankee than chances are you'll be alright. If the Fresnel component is in fornt of the ground surface as it faces the lens then chances are you won't be alright.
Walter Glover
"We see things not as they are. We see them as we are."
— Emanuel Kant