Re: [APML] 35 mm Camera & Focuser

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

John, for those of us with cameras with removable pentaprisms, would this
thing plunked directly down onto the focus screen work? I'm still shooting
piggyback so I've focussed using the the Hartmann mask technique but when I
finally make the jump to prime focus, I think I'll need something better
than what I've got.

Anyone else, I've got two Nikon F2's so if there is another means that works
for sure on this camera, I'd love to know it - mostly what I read is that I
buy a loupe and file it down to fit into the top of the camera and rest on
the focus screen - if I get one that is adjustable, is that better so that I
don't have to fine tune the filing job for height?

Stuart
----- Original Message -----
From: "John C. Mirtle" <spampit@shaw.ca>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Friday, December 12, 2003 8:54 PM
Subject: Re: [APML] 35 mm Camera & Focuser


> Alan,
>
>  --- Serge Theberge <serge.theberge@wti.on.ca> wrote:
> > - John also suggested to consider getting the 6x30 Lumicon "critical
focus
> >magnifiers" which can be mounted on the Olympus viewfinder by gluing the
> >Lumicon to the metal frame of the eyeguard, thus enabling it to be
> >fixed to the camera.
>
>
> > I'd like to ask if anyone has used the above-mentioned magnifier, and
> > your impressions of it. Also, will attaching it in this manner in any
> > way hinder other uses of the camera? Pics?
> >
> > Thanks,
> > Alan
> - - - - - - - - - - - - - - - - -
>     I have been using this system since the late 80's. There is no
> modification to the camera at all, I use a simple mod that allows the
> Lumicon magnifier to stay attached to the camera without having to hold it
> in place. The magnifier is visible at http://www.lumicon.com/6x.htm - just
a
> lightweight plastic 6x finder. (cheap) I picked up a rubber viewfinder
> eyeguard for my OM1 that had a metal frame, and glued the frame to the
front
> of the magnifier. After that I followed Lumicon's focusing procedure. It
> simply clips on when you need it and slides off when you are done
focusing.
>     I must have shot at least 1000 prime focus shots this way, success is
> over 80% for well focused tech pan shots. Many failures are due to the
> camera sitting on the focuser crooked, few are the fault of the focuser.
> Some people say that this system isn't reliable or accurate enough. Others
> say it can't work because your eye can accommodate focus shifts. The
> magnifier has crosshairs, which gives your eye a reference point to focus
> on. For _me_ the system works well. Your mileage will most certainly vary,
> but hey - you are only gambling $20!! You decide - I have plenty of
examples
> at http://members.shaw.ca/jmirtle/astro.htm . Anything shot prime focus
> without a cold camera was focused with the magnifier.
>
> John Mirtle
> Calgary, Ab. Canada
>
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