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AlienFirstClass
professor emeritus
Reged: 02/13/09
Posts: 741
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Try an used pair of the Orion Megaview 20x80.
Nice Japanese binoculars.
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charen
Pooh-Bah
Reged: 05/28/05
Posts: 1083
Loc: New Zealand
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This Polish review of the earlier Viven 20x80 BWCF gives the aperture a true 80.1 and 80.2 mm for left and right lens. This review is dated 2005. The Ark series came after this version. One hopes the aperture remains the full 80 mm.
This Polish site is called 'Optyczte.pl'
The Polish to English translation is at times poor but the general themes are clear.
http://translate.google.com/translate?hl=en&langpair=pl|en&u=http://optyczne.pl/16.1-Test_lornetkek_podsumowanie-Test_10x42_-_opinie_testuj%C4%85cych.html
If you look under 'tests' and 'test binoculars' - the Vixens will come up. This site has numerous other reviews with interesting results.
Chris
There are numerous other reviews under 'tests'.
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35 binos.
80mm Cat.
WO66ED
SV NH 80mm / EQ3
Meade 8in.LX90
Skywatcher Equinox ED120 / Goto HEQ5.
Edited by charen (07/04/09 06:07 PM)
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Mark9473
Post Laureate
Reged: 07/21/05
Posts: 3210
Loc: 51°N 4°E
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Chris, is the 80.1/80.2 value a measurement of the diameter of the objectives, or is it an effctive aperture determined by taking into account the effects of e.g. an internal stop or the prism sizes?
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Mark
Leica 8x20; Vixen 8x42; Swift 8.5x44, 10x50 and 20x80; TS 7x50; Orion 15x63; Docter 15x60
WO Megrez II 80 FD + Baader 90° T2 Amici
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 14731
Loc: Cumberland, R I , USA42N71.4W
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Quote:
Chris, is the 80.1/80.2 value a measurement of the diameter of the objectives, or is it an effctive aperture determined by taking into account the effects of e.g. an internal stop or the prism sizes?
I'm pretty certain it is the former.
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
member#21
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charen
Pooh-Bah
Reged: 05/28/05
Posts: 1083
Loc: New Zealand
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Yes I believe it is just the actual measurement of the lens. Following a conversation with Kenny in a seperate post apparently this site has had some historical debate about the methods used to establish the actual technical specificiations so I believe it may not be fully reliable.
Chris
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35 binos.
80mm Cat.
WO66ED
SV NH 80mm / EQ3
Meade 8in.LX90
Skywatcher Equinox ED120 / Goto HEQ5.
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Mark9473
Post Laureate
Reged: 07/21/05
Posts: 3210
Loc: 51°N 4°E
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I don't doubt it's a reliable measurement, just as long as it's understood it's the diameter of the objective as measured from the outside.
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Mark
Leica 8x20; Vixen 8x42; Swift 8.5x44, 10x50 and 20x80; TS 7x50; Orion 15x63; Docter 15x60
WO Megrez II 80 FD + Baader 90° T2 Amici
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