Re: [ATM] Ghosts in the Coulter

[Mike Lockwood <melockwo@uiuc.edu>]

Hi,

A most interesting sketch.  The only time I have seen something like 
it is when I was viewing Mars with my 10" F/6.8 and the plate glass 
mirror (~1.25" thick) hadn't cooled off yet.  I saw multiple Mars 
images, but they were moving around rapidly.

Do these ghost images move over time?  You have a closed tube, so 
given my experience, tube currents could cause this, but the images 
would probably move a bit over time.

As I recall from past messages, the primary is not glued in, and is 
1.25" thick, and possibly Pyrex.

Is the secondary glued to its support?

You might try an off-axis mask or stopping down the scope to see if 
the images only appear when one area of the primary/secondary is 
receiving light.

	Mike Lockwood


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