Re: [APML] 35 mm Camera & Focuser

["Stuart Heggie" <stuart.j.heggie@sympatico.ca>]

Okay Bill - you win! Do it right, right?
Stuart
----- Original Message -----
From: "William R. Mattil" <wrmattil@ix.netcom.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Saturday, December 13, 2003 9:15 AM
Subject: Re: [APML] 35 mm Camera & Focuser


> Stuart Heggie wrote:
>
> > I sense from what I've read that the most success seems
> > to come from people who are putting an eyepiece or loupe on the focus
screen
> > directly and studying the tightness of the star's image on the matte
portion
> > of the screen.
>
> I think that more successful Astrophotographers use a knife edge.
>
> > With prime focus, you have no way to lock the
> > scope down permanently (unless you never plan to look through it I
guess).
>
> Nah that wouldn't work either .... Temperature shift and all.
>
> Build a knife edge into an extra camera body or use a calibrated device
> with exactly the same measurements as the camera body you are using.
> Hutech is one example of this type of device.
>
> Regards
>
> Bill
>
> --
> William R. Mattil |
> wrmattil@ix.netcom.com | http://celestial-images.com
> (972) 399-4106 |
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