Hi there,
Kevin is right, ground glass would be too coarse for focusing, it would need optically flat plain glass with fine etched crosses to focus on, and then back&forth thru the loupe for parallax focus like ultra-fine copy work. Maybe B&L still makes glass like this, maybe AR coated.
Film flatness will not be held to such tight specs without a ceramic vacuum back like RTSIII, maybe Kyocera can make one up. Spelled major $$$, they work down to a 1/4 wavelength of light tolerance.
What LPMM can human eyes resolve??? Overkill!!!
This has been happy high school bench racing, good fun.
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