I'm using a Chamonix 45N-1 4x5 camera which comes with a fresnel focusing screen. The screen is set up on the lens side from the ground glass and the grooves are also facing the lens. It is a plastic screen and it has a small round hole in it through which I can see the image on the ground glass itself.
When I focus by the image that comes trough the fresnel I get different focusing distance from when I focus through the small hole in fresnel by the image on the ground glass. From what I gather there should be no such difference, since with a narrow depth of field my focus would be off in one case or the other. I assume the ground glass focus would be more precise and this is what I'm using, but then the fresnel gets in the way of checking the focus throughout the frame.
Is this something expected or am I doing something wrong?
Thanks!
Bookmarks