Re: [APML] Hartmann Mask

["Teo Mattas" <t_mattas@hotmail.com>]

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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