Re: [APML] astro camera idea

["Bobby Middleton" <bobm@koyote.com>]

I've got a 2.7" newt focuser and a 2.7" OAG so I've pondered putting those
on the newt. If there was a good 120 film the decision would be easy. I
wouldn't gain much of the 67 frame without abberations, but I'd solve the
35mm vignetting problem.
Bobby

----- Original Message -----
From: Matt BenDaniel <matt@starmatt.com>
To: <astro-photo@seds.org>
Sent: Wednesday, December 19, 2001 4:04 PM
Subject: Re: [APML] astro camera idea


> Bobby,
>
> How about just an adaptor to attach a stock Pentax 67 to the newt OAG?
> You'd get no vignetting (due to the camera body itself) within the
> central 24mmx36mm area.
> ...as long as you can deal with fewer available color negative films.
>
> Matt
>
> Bobby Middleton wrote:
> >
> > I want to try something with one of my Nikon F's. I want to see about
> > removing the lens mount assembly, the mirror, and trimming the inside of
the
> > throat to make the camera opening larger to stop my vignetting I get
when I
> > shoot my 12.5" newt. In a normal composition the corner vignetting isn't
> > that bad, but for mosaics it's a major problem to remove the darker
corners
> > so they blend into the other frames easily. Besides the corners, the
frame
> > at top front of the camera where the mirror slaps up against leaves a
> > horozontal band of lesser illumination all the way across the top of my
> > negatives.
> > I would need a special connection machined to mount to the front of the
> > camera that would let me hook up to my newt OAG. This will have to match
the
> > correct spacing distance to retain critical focus. Also a dummy camera
for
> > composition and focusing will be necessary.
> > Is my idea taking the long way around to get somewhere? There are some
> > Taurus astrocameras made just to solve this problem but I did not like
them
> > at all. Thoughts? Suggestions?
> > Bobby Middleton
> --
> Matt BenDaniel
> http://starmatt.com
>
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