The ground glass has "grain" and this does not allow to see all the resolving power a lens has, anyway some screens have finer grain that other.
There is a procedure described here (
http://www.largeformatphotography.in...l=1#post369572) that instructs to use a powerful magnifier to check the shimming directly in the ground glass.
A better way would be using an eyepiece (from a telescope or microscope) attached to the camera back, and finally you may attach a DSLR (Nikon D3400, for example) to the camera back, you can DIY attach a DSLR extrension ring for macro, that has an F mount, to a plating that will fit in the film holder spring back, with the ground glass removed. A DX DSLR has around 250 pix per mm, so it can record very well if the LF lens is performing better or worse, if you have the DSLR attached to a computer (tethering) you would see it with perfect convenience in a big monitor !
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