Re: [ATM] Baffles

[johncdeitz@comcast.net]

Hello Nils, Anthony and All:
I have taken the liberty of adding a few lines to your drawing Anthony:

http://www.atmlist.net/contrib/johncdeitz-at-comcast-dot-net/6f8T8MODJ.JPG

(sorry I had incorrect URL on last message!)

in illustration of baffle method by drawing. One proceeds by 1) sketch a line 
from edge of tube to edge of mirror nearest 2)another line from "far" limit of 
field 3) the intersection of these two lines is baffle nearest primary. This 
results in more baffles and the first (nearest primary) being considerable 
closer than in original sketch. See Pg 222 Telescope Optics, 1988.
John Deitz

http://www.atmlist.net/contrib/johncdeitz-at-comcast-dot-net/6f8T8MODJ.JPG
 -------------- Original message ----------------------
From: johncdeitz@comcast.net
> Hello Nils, Anthony and All:
> I have taken the liberty of adding a few lines to your drawing Anthony:
> 6f8T8MODJ.jpg
> in illustration of baffle method by drawing. One proceeds by 1) sketch a line 
> from edge of tube to edge of mirror nearest 2)another line from "far" limit of 
> field 3) the intersection of these two lines is baffle nearest primary. This 
> results in more baffles and the first (nearest primary) being considerable 
> closer than in original sketch. See Pg 222 Telescope Optics, 1988.
> John Deitz
>  -------------- Original message ----------------------
> From: 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
> > 
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
> 
> 
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