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Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
KennyJ
Reged: 04/27/03
Posts: 10446
Loc: Lancashire UK
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Re: upgrading from 15x70
05/25/08 10:12 AM
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< On the topic of AFOV... how do you convert published bino field of view specs to AFOV ? >
Well , it's not a precise method , but if the TFOV isn't already stated in degrees ( which in the case of the BigBinoculars.com site for the Oberwerks in question , it is ) then simply convert the feet / 1000 yards or metres / 1000 metres to DEGREES ( a conversion chart was posted quite recently for that ) then multiply the TFOV in degrees by the magnification .
e.g 1: Oberwerk 15 x 70 Ultra with 4.4*TFOV
AFOV = 15 x 4.4 = 66* AFOV
e.g 2 : Oberwerk 20 x 80 standard with 3.2*TFOV
AFOV = 20 x 3.2 = 66* AFOV
As mentioned , these are rarely precise , but near enough in most cases for us laymen to know !
Regards
Kenny
--------------------
If everyone is thinking the same thing , no-one is thinking - General George S.Patton
Zeiss 7 x 42 BGAT
Captain's Helmsman 7 x 50
Nikon 10 x 42 Superior E
Swift Audubon Kestrel 10 x 50
Helios 15 x 70 Observation
Strathspey 20 x 90
Televue 76 APO
Zeiss 85 Diascope
Helios 102 f5 refractor
Various eyepieces barlows tripods mounts etc.
Panasonic Lumix DMC - TZ5 digital camera
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