Re: Baffling and A comment
Jay Reynolds Freeman (freeman@netcom.com)
Fri, 31 Mar 1995 20:34:44 -0800
My six- and eight-inch Newtonians have solid, resin-impregnated fiberboard
tubes (the stuff that Parks sells, or used to), spray-painted flat black on
the inside. The tube extends more than one mirror diameter skyward of the
focuser. I touched up the matte black surfaces on the diagonal holder with
more paint, and for observations of faint objects I leave the (black) dust
cap on the lower end of the tube, to keep stray light from sneaking up past
the primary. (The cap comes off at higher magnification, to avoid wedging
of cold air in the tube.)
These instruments have worked pretty well for observations of low-contrast
objects: The six-inch is the one with which I saw the H*rs*h**d N*b*l* at
36X.
-- Jay Freeman