Joe,
I have F/F2 , F3 and D2X screens in front of me.
D2X is quite different. F to F3 screens are made up of two sections Fresnel and Magnifier. D2X is single piece and a lot thinner.
So now we have crossed F100 from the list I will see if I can find out info on the F6.
Never had a F4 so no ideas on that score.
Don
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