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Ross No. 5 Mk 4 “Tuna Can” 7x50

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#1 zombie1210

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Posted 28 October 2020 - 07:57 PM

I picked these up today. An interesting looking bin. 7x50 and they are nice and bright. Very clean inside and out.   Very solid feeling without being too heavy. 

 

Any idea of how to date them? I'm guessing 1943 or 1944. These were used a lot by coastal watchers. There is a range finder "Graticule" on the right side.

 

JD4bO35.jpg

 

25y85HZ.jpg

 


Edited by zombie1210, 28 October 2020 - 08:05 PM.

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#2 publin

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Posted 29 October 2020 - 04:31 AM

your   bino   is  more  similar   to  the  N.I.L   7X50  MK4  [ watch  link ]        the  ROSS   have    on the prism plate  the  big letter  R   or   RL   [  ross london]  and   MK5  7X50     .  in your's   N'RSL ??    BTW    ROSS   and   N.I.L  [ subsidiary  of ross] are   patrners   and  produce   together   bino's   at  the  WII   era.  .    regards   -  publin        https://www.flickr.c...57623391404840/


Edited by publin, 29 October 2020 - 04:35 AM.


#3 Pinewood

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Posted 29 October 2020 - 10:22 AM

Hello Publin,

 

I think that the name of the manufacturer might have been painted over, when the binocular was upgraded, post WWII.  I assume that it was upgraded because it looks coated.  My No, 5, Mk 5 has no manufacturer's name.

 

Stay safe,

Arthur



#4 brentwood

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Posted 29 October 2020 - 10:46 AM

Very nice example! I have one, but quite rough. I also have a pristine 7x35, I think with a nice thick leather case. I was really excited at first as I thought I'd snagged a 5x35, I'm still looking for one of those! 



#5 zombie1210

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Posted 29 October 2020 - 11:03 AM

The red knobs are for heaters?  Like to hook a battery to?

 

EDIBmeK.jpg


Edited by zombie1210, 29 October 2020 - 11:17 AM.


#6 FrankL

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Posted 29 October 2020 - 11:22 AM

No. They are for dry air purging.


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#7 FrankL

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Posted 29 October 2020 - 12:08 PM

This is a similar one in my collection with some information about the model: https://www.flickr.c...e-9rDhMD-aDeDU8

Note that yours has a V Optical Stores coding on the right prism whereas mine has an older style OS coding. Your binocular being made circa 1942 would have originally been marked with an OS coding which after the war was removed and replaced with the new V coding.


Edited by FrankL, 29 October 2020 - 12:10 PM.

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#8 zombie1210

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Posted 29 October 2020 - 01:44 PM

Some great info Frank. Thanks



#9 John A Roberts

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Posted 29 October 2020 - 05:31 PM

In addition to Frank’s detailed information, also see Terence Wayland's extensive research on Ross binoculars

A set of documents can be found on Peter Abrahams' classic Europa site, at: http://home.europa.com/~telscope/Ross/

 

There’s a PDF on military binoculars. See from page 5 on regarding the No. 5 models:

- it indicates that  the No. 5 Mk IV was introduced in November 1941, and
- the text then goes on to list serial numbers and production dates

 

- - - -

 

The Europa site has extensive information on discontinued binoculars, and the home page can be found at: http://www.europa.co...pe/binotele.htm

 

 

John


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#10 Pinewood

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Posted 29 October 2020 - 05:49 PM

No. They are for dry air purging.

Hello Frank,

 

 

Thank you.  That was my original thought but some ill informed indvidual assured me that they were heater terminals.

 

Stay safe,

Arthur



#11 zombie1210

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Posted 29 October 2020 - 05:49 PM

I am quite impressed with these. They exhibit nice bright and sharp views, and I really don't notice any focus falloff at the edge of the FOV. I had them with me all around town and in the mountains today. Very easy and relaxed viewing. Did I mention that I like them?



#12 FrankL

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Posted 31 October 2020 - 01:47 PM

I am quite impressed with these. They exhibit nice bright and sharp views, and I really don't notice any focus falloff at the edge of the FOV. I had them with me all around town and in the mountains today. Very easy and relaxed viewing. Did I mention that I like them?

See the 5th paragraph of this Flickr link regarding the occurrence of field curvature in British WW 2 period Porro II binoculars: https://www.flickr.c...pg/15047255303/

In short, many but not all of these binoculars show it, and the reason why some have it and some don’t is unknown, but I believe it’s because of the quality or type of optical glasses used in the binoculars. And the ones having good edge sharpness like yours do have an exceptionally fine view. 



#13 zombie1210

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Posted 31 October 2020 - 01:52 PM

I had them out under clear skies last night. They are quite good at night, under the stars. A nice dark field with precise pinpoint stars. 




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