Re: [APML] Frost on the ST-4. was: ST-4 values?

[Bert Katzung <katzung1@home.com>]

Hi Joe:
I don't know about VERY strong light, but the red flashlight causes no
problems at all. Of course, I do a new dark frame after waiting several more
minutes for any after image to dissipate.  Hope this helps...
Bert

Bert Katzung
katzung1@home.com
www.astronomy-images.com

----- Original Message -----
From: "Joe Mize" <jmize@globe-net.net>
To: <astro-photo@seds.org>
Sent: Monday, August 27, 2001 5:39 AM
Subject: Re: [APML] Frost on the ST-4. was: ST-4 values?


> Bert;
>
>      I've always wondered, will a strong light harm the CCD or circuitry?
I've
> always treated mine as if it would, just to be on the safe side...joe  :)
>
> bert katzung wrote:
>
> > ...snip... I look at the chip with my flashlight
> > to make sure there's no sign of frost.
> >
> > Bert Katzung
> > katzung1@home.com
> > www.astronomy-images.com
> >
> > ----- Original Message -----
> > "Shekhar Borde" <shekhar@prodigy.net>
> > said:
> > > Thanks, but I am pretty sure it's not frost.  I live in California <g>
and
> > > I have seen this problem when it's 70 degrees outside.  Anyway, my
> > > ST-4 unit is quite old and doesn't have a dessicant ring.  I think
SBIG
> > > added that later.
> > >
> > > I have never really had any problems with mine -- I've just wondered
why
> > > it won't saturate even with the brightest star.
> > >
> > > Shekhar
> > >
> > > > Be sure the window isn't frosted over from the inside. The dessicant
> > needs
> > > > to be removed and baked occasionally, I did mine every year when I
had
> > an
> > > > ST4. If it frosts up, even a little, the brightness readings get
lower.
> > This
> > > > was one way I would notice that it was time to bake the dessicant.
> > > >
> > > > Steve...
> > > >
> > > > swalters@att.net
> > > > http://astrophoto.home.att.net
> > > >
> >
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> --
>        "May You Go Among The Imperishable Stars"
>
>                               Joe Mize
>                       http://sfo.sciastro.net
>                   mailto:jmize@globe-net.net
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