Quote Originally Posted by rknewcomb View Post
A somewhat related question...
2) If most any groundglass is used with a fresnel on the OUTside, does it keep the focus point the same so the image is focused properly on the film?
thanks!
Robert
Manufacturers vary in their use of the fresnel in front of, or behind, the GG.
If you're in doubt, best to contact the manufacturer to see what's what, or post the question here for your specific camera make and model.

So switching the fresnel to the front when it should be behind might cause focusing errors.