Re: [ATM] Baffles

[Anthony Stillman <atmer@flash.net>]

Using the parameters John supplied, and the values I
was already using for everything else, I made some
more drawings.

The first drawing shows an 8 inch tube only.  A single
baffle is needed.
http://www.atmlist.net/contrib/atmer-at-flash-dot-net/6f8T8.jpg

The second drawing has the tube inflated at the mirror
end.  The powder purple and dark red lines show that
no baffle is needed.
http://www.atmlist.net/contrib/atmer-at-flash-dot-net/6f8T1025.jpg

I drew a more accurate depictions of the 6 inch f/5 
with an 8 inch tube
http://www.atmlist.net/contrib/atmer-at-flash-dot-net/6f5T8.jpg

And did the same for the f/12
http://www.atmlist.net/contrib/atmer-at-flash-dot-net/6f12T8.jpg

The baffles Nils Olof identified in his last post are
depicted in these images.  The smallest possible
baffles are also depicted.  Their distance from the
primary and extension into the tube are enumerated.

Note that the extent of sky light that can reach the
image by way of the tube and primary mirror is
constrained.  These constraints are the upper end of
the tube, the opposing edge of the primary, the edge
of the secondary, and the edge of the field.  The
secondary can play a dual roll in that it may limit
the entrance rays as they head toward the opposing
edge of the primary.  This is made apparent by the
green line in the f/5 drawing.  

It's still baffles one, big tube zero.

Anthony


a priori, a posteriori
from what comes before, from what comes after

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