i just got a graflok back with a fresnel plate and a groundglass. now i was wondering ... 1. what is the fresnel usefull for? can't you just focus on the ground glass? 2. if you put the fresnel in, how should it be done? on the lensside? or rather on the filmside? 3. what side of the fresnel has to face the ground glass? the smooth surface? or the surface with the "circles" on? thanks! maarten.