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KennyJ
Reged: 04/27/03
Posts: 10446
Loc: Lancashire UK
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Re: Roof prism phenomenon
02/21/05 12:58 PM
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< The roof prism construction has some advantages, but one disadvantage is the ray of light phenomenon. This ray of light is mostly only noticeable when looking at strong lights as streetlights in the night and the moon, and makes the image resembling of a star filter picture but with a single ray in each eyepiece >
Patric,
This is the first I've heard of this "phenomenon".
Before I can check for myself tonight ( which I intend to do with my Zeiss 7 x 42 B G AT roofs ) I think I need a little more clarification about what you mean by "resembling of a star filter picture" ?
I note that both of the roof prism models you quote in your example are COMPACT models -- could this be a factor ?
By the way , I see far more annoying reflections through my Telstar and Swift 10 x 50 and Helios 15 x 70 PORROS than I do through the Zeiss roofs !
Regards , Kenny
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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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