OT: Question for Royal Navy binocular grogs (Full Version)

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panzerwilly2 -> OT: Question for Royal Navy binocular grogs (2/6/2018 6:39:47 PM)

Hello, I have a pair of Barr & Stroud 7X CF41 7X50 binoculars that I inherited from my Grandmother. She was married to a British Army Officer who served in WWII. I looked up the binocular's serial number and they were manufactured in 1945. They work wonderfully, but I have a question. They have a red, yellow, and green filter switch for both lenses. In what circumstances would each be used? Sun, fog, night etc... thanks!



JeffroK -> RE: OT: Question for Royal Navy binocular grogs (2/7/2018 4:32:22 AM)

quote:

Barr & Stroud 7X CF41 7X50

The green and yellow filters were meant to increase the contrast of a grey ship against a blue sky and sea while the grey filter was to flatten contrast when looking into bright sunshine or a searchlight beam. This information is thanks to William Reid's fascinating book, " ' We're certainly not afraid of Zeiss' Barr & Stroud Binoculars and the Royal Navy", ISBN 1-901663-66-3, NMS Publishing Limited (National Museums of Scotland), 2001.
https://www.flickr.com/photos/binocwpg/4407390939/in/set-72157623234405689



panzerwilly2 -> RE: OT: Question for Royal Navy binocular grogs (2/7/2018 5:46:00 PM)

Thanks very much! I'll take them house boating this summer and see if I can spot any U-boats :-)



JeffroK -> RE: OT: Question for Royal Navy binocular grogs (2/7/2018 6:25:12 PM)

Treat them well, they appear to be worth a bit on the market.



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