Re: [APML] Hartmann Mask

[George Anderson <georgea@cam.org>]

Teo

Is your Zenit the older one with the M-42 screw mount for the lenses or
the newer one with the Pentax K bayonet?
You may want to see if you can buy a dead/broken Zenit locally and make
your own knife edge focuser. There are several websites with the details
on how to do this, and the cost can be quite cheap depending on how much
you have to pay for the dead camera body.

George Anderson
Montreal Canada

Clear skies and good health

Teo Mattas wrote:
> 
> 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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