This originally came from Bob Salomon at HP Marketing, via a usenet discussion. I send it on with his okay. I thought it might be of interest largely to large f ormat newcomers; it seems like really good advice.
"To use a loupe properly you must do the following:
1: Loupe must be focusing type! 2: Remove the lens from the camera 3: Point the lensless camera at a light source 4: Place the loupe on the ground glass 5: Focus the eyepiece of the loupe till the grain pattern of the gr ound glass is sharp 6: Replace the lens
You now have a loupe that is focused on the grain of the ground glass. Not on t he back side of the glass.Using a non focusing loupe or an improperly focused lo upe, or a reflex viewer you are focused on the back side of the glass and are ou t of focus by the thickness of the ground glass and possibly the fresnel package ."
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