I had planned on buying a Fresnel lens for my 4x5 to try this out. Then after reading this thread I just went ahead and bought myself a cheap one on Amazon and cut it to the size i needed.
http://amzn.to/2FI0nx7 These are the results I got:
Before:
After:
I photographed the Ground glass with my DSLR set to manual. Camera settings and subject lighting were identical for each photo (a Spotted sheet behind a white sheet, so it looks like blurry spots). You can see it made quite a difference. And you can also see that the Fresnel can be seen in the ground glass. The Fresnel was on the lens side of the Ground Glass. I tried facing the Fresnel forward & backward against the ground glass. It didn't make a difference.
So there you have it!!
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