Front view w/starlight mounted
Here you can see the large front lens daytime light filter, these systems were very sensitive to light, a bright light source (daylight) could "fry" the intensifier, they were fitted w/the filter on the front which had to be kept on when used in daytime, it was attached to the scope itself by a simple rubber ring & when night operation ensued you just took the filter off the scope body & it remained attached but out of the way.
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