From: "Stathis Kafalis" 
To: "ATM" 
Reply-To: "Stathis Kafalis" 


> >>> > Dave Sopchak made an 18" mirror
> His all aluminum scope designs are worth looking at too, not to

Is there any webpage or e-mailable pictures of this?

Performance:
>  ....Excellently with no trace of 'stig and incredibly fast cool down
times,

That's good news

Stathis Kafalis
http://www.geocities.com/dobsonstathis

----- Original Message -----
From: "Mel Bartels" 
To: "ATM" 
Sent: Sunday, February 16, 2003 1:38 AM Subject: Re: ATM 14" ultrathin mirror


>
> >>>  I am not thinking of thinner material but larger apertures.
>
> The thinnest attempt I ever saw was a 1 inch thick x 48 inch plate glass.
> Unfortunately it shattered when a hot pitch lap was placed on it.  A
> successful 27 inch mirror was made out of the largest remaining piece, I
> believe.
>
> >>> > Dave Sopchak made an 18" mirror
> > out of 0.875" glass and another follow on the ATM list made
a nice 20"
out
> > of 0.875" glass
> >>> Do you know, how good this mirrors perform?
>
> Excellently with no trace of 'stig and incredibly fast cool down times,
> having observed with his scope at both the Winter Star Party in Florida and
> the Oregon Star Party (interesting how his scopes made it from coast to
> coast).  His all aluminum scope designs are worth looking at too, not to
> mention his software efforts with the MacDOB project.
>
> Mel Bartels
>
>
>

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