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mclewis1
Thread Killer
Reged: 02/25/06
Posts: 3932
Loc: New Brunswick, Canada
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Re: Web Cam Philips SPC1300NC
04/09/08 10:31 PM
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Reflecting scopes bring more than just the visible spectrum of light to a single focus point, they also focus infrared and UV at the same point. Refractors don't focus these wavelengths at the same point (and some don't even get all the visual wavelengths together which is one of the reasons for big buck APOs).
So when you use a refractor with an imager like a webcam that is also sensitive to the infrared and UV ends of the spectrum unless those wavelengths are blocked (with the filter) you'll get some out of focus stuff in your shots even though the subject looks perfectly focused.
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Mark
C11, C6, APM/TMB115, and AT80ED - Tandem mount CGE and CG-5A, WO EZ-Touch and AT Voyager
25x100s and 8x56s, T-Mount Light, Mark 1 eyeballs - Modded 350D, DSI-P, SPC900, Mallincam
Just because you can doesn't necessarily mean that you should
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