Originally Posted by Discoman
but putting a Fresnel lens on some cameras ends up shifting the plane of focus out of the plane the film resides in.
This is only true if the Fresnel goes between the lens and the ground glass. If it goes on the back of the ground glass, i.e. towards the user, it doesn't make any difference.
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.