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tjspelich
newbie
Reged: 09/12/09
Posts: 4
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Hi,
I am a binoviewer rookie and I would like to better understand the magnification when a binoviewer is introduced into the viewing path of a telescope. I have a Stellarvue Nighthawk Classic, 480/80 telescope. Let's say for the purpose of my education I put a Denkmeier, The Big Easy, binoviewer on it and I want to select an eyepiece pair from the normal suspects. That is Panoptic 24mm or 19mm, Denkmeier 21mm or 14mm. So what can I expect in terms of the actual power I could expect to be viewing at given these choices in eyepieces? The Denkmeier web site suggests a 1.4X and 2.5X magnification factor with a refractor telescope. Would it be as simple as using this factor? Other posts on this forum seem to indicate it is not that easy. Are there any reference materials that would help me better understand the relationship between the binoviewer and the resulting eyepiece power? Thank you in advance for any information you could provide.
Tim
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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 14732
Loc: Cumberland, R I , USA42N71.4W
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In a Refractor binoviewer power is easy. If you are able to use it without any adapter, the power will be just as if you stuck your eyepiece directly into thhe refractor. BUT, in almost all cases, the binoviewer eats up so much of the focal length that there is not enough IN travel on the focuser tube to get the eyepiece focal plane in near the telescope focal point, so with the BV in the refractor often you can't reach focus.
That's why the BV suppliers provide different powers of adapters like the 1.4x or the 2.0x. With that little piece screwed onto the front of the binoviewer, now you CAN reach focus. To figure your power in your refractor, use the factor provided.
Where power factors get really interesting is in SCT scopes, which have movable mirrors and variable focal length. They are very different from refractors. BV adapters are not needed for SCT scopes, but power is never 1x due to the nature of the type of scope.
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
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tjspelich
newbie
Reged: 09/12/09
Posts: 4
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Thank you.
Tim
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