Re: [APML] 48 Inch Schmidt Telescopes

["John C. Mirtle" <jmirtle@shaw.ca>]

Gerry;
    IIRC the 48" at Palomar used 14" square glass plates of the 103a series
film. Many cracked as they were bent to conform to the curved focal plane. I
seem to remember reading somewhere that the corrector lens was upgraded to a
doublet, to improve chromatic performance. I also seem to remember that it
has been upgraded to CCD's. Don't ask me to remember where I read this - I
can't even remember what I had for dinner yesterday.....

John Mirtle
Calgary, Ab. Canada

----- Original Message -----
From: "Jerry Lodriguss" <jml@astropix.com>
To: <astro-photo@seds.org>
Sent: Wednesday, July 31, 2002 11:18 PM
Subject: [APML] 48 Inch Schmidt Telescopes


> Does anyone know the status of the two big Schmidt telescopes that took
the
> images for the Palomar Sky Survey?
>
> Are they still operational and shooting film, or have they been converted
> to CCD?
>
> Anybody know what size film plates they used to shoot when they shot film?
>
> Thanks,
>
> Jerry
>
> Astronomical photography: http://www.astropix.com
>
>
>
>
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