Re: [APML] Focusing OM-1 - but what about the Nikon F2?

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

Duncan, thanks! I have the cross-hair screen and DW-2 6x magnifying viewfinder. Are you really able
to get sharp focus with this? I find that there is a large range of settings of the DW-2 for which
I cannot tell the difference in focus on the cross-hairs.
Stuart
----- Original Message -----
From: "Duncan Munro" <dmunro@sfu.ca>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Sunday, November 14, 2004 1:39 PM
Subject: Re: [APML] Focusing OM-1 - but what about the Nikon F2?


> If I can jump in here, I have a Nikon F2 and the Nikon 6x magnifier that
> replaces the prism. For best result,s to focus directly on the focus
> screen, you will have to have one that has a cross hair etched onto it.
> I use a photomicrophotography screen with a cross hair etched on it. You
> focus the magnifiers diopter adjustment onto the crosshair and only then
> can you get good focus with the magnifier on a star or planet. If you
> don't focus on a  crosshair your eyes will attempt to accomodate the
> focus and the exact focus position will be hard to determine.
>
> cheers
>
> Duncan
>
> Stuart Heggie wrote:
>
> >Yes - the wisdom of John Mirtle is not to be discounted! John, do you think it will work to
focus
> >directly on the focus screen with the viewfinder removed from my Nikon F2?
> >
> >Stuart
> >----- Original Message -----
> >From: "Alan Voetsch" <alanv12952@yahoo.com>
> >To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> >Sent: Friday, November 12, 2004 11:21 PM
> >Subject: [APML] Focusing OM-1 (Was:Film Images)
> >
> >
> >
> >
> >>Stuart,
> >>
> >>I thought it might be beneficial for me to jump in here and pass on the
> >>same advice to you that John Mirtle gave to me last year. He
> >>recommended the Lumicon 6X Critical focus scope. I think it still sells
> >>for about $20. Easy to use and because I use it with my Taurus, the
> >>focus is easily repeatable and only needed to be done once. Your
> >>mileage may vary, but it is an inexpensive option.
> >>
> >>Alan
> >>
> >>--- Stuart Heggie <stuart.j.heggie@sympatico.ca> wrote:
> >>
> >>
> >>>Thanks Joe! I might have to take the plunge. I've focused mine using
> >>>a Hartmann mask but my longest
> >>>lens is very temp dependent.
> >>>Stuart
> >>>----- Original Message -----
> >>>From: "joe" <jmize@svic.net>
> >>>To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> >>>Sent: Friday, November 12, 2004 9:23 AM
> >>>Subject: Re: [APML] Film Images
> >>>
> >>>
> >>>
> >>>
> >>>>Thkx Stu;
> >>>>
> >>>>     I bought a Heutech Mitsuboshi Knife Edge focuser for my OM-1.
> >>>>
> >>>>
> >>>Great
> >>>
> >>>
> >>>>device, easy to use.  Actually you should see the test shots I did
> >>>>
> >>>>
> >>>last week
> >>>
> >>>
> >>>>in dry air.  Now those really showed tight stars...joe  :)
> >>>>
> >>>>
> >>
> >>=====
> >>SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
> >>FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
> >>& http://www.pbase.com/avoetsch12952/fs102
> >>
> >>
> >>
> >>__________________________________
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> >>www.yahoo.com
> >>
> >>
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> >>
> >>
> >
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