Re: [APML] Hartmann Mask

["Bert Katzung" <katzung1@comcast.net>]

Hi Teo:
Go to:
http://www.sciencecenter.net/hutech/index.htm
for all the Hutech products.
Bert

Bert Katzung
katzung1@comcast.net
www.astronomy-images.com

----- Original Message ----- 
From: "Teo Mattas" <t_mattas@hotmail.com>
To: <astro-photo@seds.org>
Sent: Monday, January 05, 2004 3:59 PM
Subject: Re: [APML] Hartmann Mask


> Steve,
>
> Thank you for your advice. Since I live miles away from USA please give me
> more information!
> Does this Hutech store have any web site?How can I find them?
>
>
>
>                         Thanks
>
>
>                           Teo
>
>
> >From: steve banbury <banburys@sonic.net>
> >Reply-To: Discussion of Film Astrophotography <astro-photo@seds.org>
> >To: Discussion of Film Astrophotography <astro-photo@seds.org>
> >Subject: Re: [APML] Hartmann Mask
> >Date: Mon, 05 Jan 2004 10:44:04 -0800
> >
> >At 04:45 PM 1/5/04 +0200,  Teo wrote:
> > >Hello group, greetings from Greece!
> > >
> > >I have a Zenit SLR camera and a 250mm f/3.5 lens.My problem is that I
> >can't
> > >find every time the true infinite focus with absolute accuracy.Will a
> > >Hartmann Mask solve my problem?I can't ''trust'' my eyes because I have
> > >astigmatism and wear eyeglasses.What should I do??
> > >
> >
> >Hi Teo--I had 'good' results with a 3 hole Hartman mask made by drilling
> >holes
> >in a plastic lens cap.  I found a knife edge focusser (KEF) to be much
more
> >accurate and in my experience more consistent when using my eyeglasses.
> >It may be possible to purchase one for your camera from Hutech in
> >California.
> >
> >Good luck--Steve
> >
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