[ATM] Shroud v.s no shroud

[Tom Krajci]

>From: "Jim Miller" <jim at jtmiller.com>

>...Once I decided to bring the "shroud" upwards rather than outwards from
the
>primary, I used a small flashlight in a darkened room pointed upwards along
>the truss tubes and moved it around until I could no longer see it through
>the eyepiece. That plus a bit more for good measure was where I stopped the
>top of my "shroud."

See:
<http://overton2.tamu.edu/aset/krajci/scope-design.htm>
and scroll down to almost the bottom to the page, to the section titled
"baffling".

This is a simpler case than the typical Newtonian because this design has no
diagonal...it's meant for imaging at prime focus.  However it still shows
some of the considerations you need to address when working out baffling for
an optical system.  (It also mentions that you can baffle by making the
baffle like a mirror box instead of a disk behind the mirror.)

Addition of the Newtonian secondary makes baffling a bit more complicated.

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Tom Krajci
Cloudcroft, New Mexico
http://overton2.tamu.edu/aset/krajci/

Center for Backyard Astrophysics (CBA)
http://cba.phys.columbia.edu CBA New Mexico

American Association of Variable Star
Observers (AAVSO): KTC http://www.aavso.org/
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