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mark cowan
Vendor (Obsidian Optics)
Reged: 06/03/05
Posts: 2316
Loc: salem, OR
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Re: Flocking vs. baffels Question
10/06/09 01:17 AM Attachment (26 downloads)
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Quote:
What do you mean exactly by "beyond the focuser" tube?
This has gotten well OT for the original poster, but here's a rough drawing of what I mean (updated - see attached).
The "light trap box" was written up by Harold Suiter somewhere (sorry) in regards to minimizing stray light in a solar scope. It's a box that sits on the opposite side of the focuser, black or flocked inside, and any light that goes into it doesn't easily come out.
Quote:
Common sense is much easier and straightforward than optical geometry.
Not. It's pointless to flock parts that can never reflect light to the focuser, just like it's pointless to install multiple ring baffles all along the tube in a newt, because the angles of reflection (which can just be drawn out on a piece of paper) dictate that stray light can only travel certain limited routes to the focuser, and the rest doesn't matter. 
Best,
Mark
Edited by mark cowan (10/06/09 04:37 PM)
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