Bureau of Ordinance. Binoculars Yellow filters.

[A. F Medic]

Have a pair of binoculars marked Bausch & Lomb, 30mm. APERT,, 6 power, Mark VII No5479 Of course US Navy. WWI (?)

My question is, " On the eye pieces are two little wheels. Turning those wheels drops a yellow filter in the viewing port of the eye pieces. What are those for? Use at dusk?."

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[browningautorifle]

Try it during less than perfect days. It gives you crystal clarity when things are hazy or a bit dark. We use shooting glasses very similar to that.