Well, the art of making goods imulation is: finding a common ground between gloomy reality and game excitement...
GWX periscope is beautiful "metal work" ( congratulations to artist) ...but in a reallity, there is no way that
outer frame (circle) would look like that - when you put your eye on it... ( or any other optical tool )
As your eye gets closer - to look trough the optic tool, the outer frame becames dark and blured outer circle, compared to your central field of view (outer world):
On the left sample, there is GWX part of Periscope.tga, and on the right one, is more realistic view trough the periscope ( watching from "closed can" into outer world... )
Just an idea to be considered as possible JGSME option;
... very simple one for "zeiss" artist... but great fun for realism maniacs.
(I did it myself for the original periscope, but GWX *tga seems to have different mixture of transparency channels and layers :hmm: )