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OT: Question for Royal Navy binocular grogs
Posted: Tue Feb 06, 2018 4:39 pm
by panzerwilly2
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!
RE: OT: Question for Royal Navy binocular grogs
Posted: Wed Feb 07, 2018 2:32 am
by JeffroK
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/ ... 3234405689
RE: OT: Question for Royal Navy binocular grogs
Posted: Wed Feb 07, 2018 3:45 pm
by panzerwilly2
Thanks very much! I'll take them house boating this summer and see if I can spot any U-boats
RE: OT: Question for Royal Navy binocular grogs
Posted: Wed Feb 07, 2018 4:25 pm
by JeffroK
Treat them well, they appear to be worth a bit on the market.