Barska 7 x 50 mm Deep Seamarine Binoculars

 
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dcrismond
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PostPosted: Thu Nov 23, 2006 4:15 pm    Post subject: Barska 7 x 50 mm Deep Seamarine Binoculars Reply with quote
Hello:
What is the yardage of the range finder?
Thank You.
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Jne_K
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Joined: 24 Sep 2003
Posts: 5509
PostPosted: Thu Nov 23, 2006 4:16 pm    Post subject: Reply with quote
Hi

All marine binoculars use an optical grid rangefinder. This is not a laser
rangefinder. An optical grid rangefinder uses a reticle which requires you
to know the height of the object in question, then do mathematical
calculations. This is an old technology that survives in marine binoculars
more out of tradtion than usefullness. To be honest, it is impractical for
field work.



You calculate range according to the following equation. it does not matter
what units you use (feet, yards, meters, kilometers) as long as you use the
same unit for all variables.



DISTANCE = ACTUAL HEIGHT

SCALE (RETICLE) HEIGHT
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