Re: [APML] Thermal Time Constants

["Andy Wallace" <andywallace@home.com>]

I don't think he says he runs the fans when he is taking his astropics :-) I
have a big dob that I blast with a box fan at the rear of the mirror to
initially cool the mirror to ambient but don't run it when I am using the
scope.

----- Original Message -----
From: "Tom & Lou Krajci" <krajcit@3lefties.com>
To: <astro-photo@seds.org>
Sent: Friday, May 18, 2001 12:42 PM
Subject: Re: [APML] Thermal Time Constants


> From: "Chuck Vaughn" <aa6g@aa6g.org>
>
> > >...I think the three small fans
> > I now have to blow on the rear surface of the mirror made the largest
> > improvement. I run them from when I take the OTA out of the truck
> > until I start the first photo.



> Can you see the effects of fan vibration at the RC's eyepiece?  Have you
> measured how much the vibration enlarges the seeing disk of stars?
>
> Tom Krajci
>
>
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