Re: [ATM] Follow-up question

["Jan van gastel" <jhm.vangastel@wanadoo.nl>]

John,

What's your reason to mount the mirror at 8 inch distance from the rear end
of the scope? If you don't need the eight inches, I would cut them off.
Personally, I like the tube to be no longer then necessary for easier moving
the scope around. I dont know if the extra inches will cause cooling
problems. Cooling problems can also be taken care off with one or more fans
and holes in the tube at the right places.


Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/


----- Original Message ----- 
From: "John Lynch" <john_p_lynch2004@yahoo.com>
To: <atm@atmlist.net>
Sent: Wednesday, August 11, 2004 4:13 AM
Subject: [ATM] Follow-up question


> To the ATM group:
>
> Thanks to those who responded to my question about
> recommended distance from the secondary mirror to
> the front end of the telescope tube.  Now for the
> follow-up question:
>
> Is it necessary to mount the mirror in its cell
> a short distance from the back end of the telescope
> tube, or would there be any harm in adding a few
> extra inches?  I suppose the concern here would be
> air currents and time for the system to reach thermal
> stability.  I'm thinking about having a total distance
> from mirror face to back end of the telescope tube to
> be about 8 inches.
>
> Any advice would be greatly appreciated.
>
> Thanks.
>
> John Lynch
>
>
>
>
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