I'm building a 200mm F6 newtonian bino and trying to decide as to how much baffling I should do. I have two CF tubes internally matt blackened (I'm experimenting with that) and they are 250 ID by 1160 long. I have been looking at several sources for calculating the diameter and spacing of baffles and there appears to be wide discrepancies in the number required.
Using Stellafane's Newt for the Web, 10 baffles are calculated, but if I use Ivan Krastev's calculator at
http://www.myoptics....bafflecalc.html or Richard Combs' calculator at
http://atmpage.com/baffle.html I get about double the number of baffles. Stellafane's calculator has few baffles between secondary and aperture (245mm) and most between secondary and primary, whereas the other calculators have many, about a third the total, between secondary and aperture.
Given that I want to achieve good contrast but not really want to do *that much* extra work if it is unnecessary, just how much baffling should I do? Baffling!
I plan to make the baffles using CF tape and black tinted epoxy resin pressed in a flat circular mold with a fixed OD. Then I would make a fixture for machining the various ID's in a lathe.
Appreciate any advice.
Keith