Re: [APML] Gas Purge for Pentax 6x7

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

Glad to hear this Steve. I was thinking that I would go in throught that
adaptor I got from you, but as you know there's not a place on it that I
could do that.
For those who might be wandering how to get a fitting for piping the N2
throught the tripod socket, Ace hardware has some little gizzmo (I can't
remember it's name) that is perfect. It's a hollow bolt about 2" long with
threads to fit a tripod socket. It has a removable rod plunger and I *think*
it is made for screen doors but my memory may be tricking me on that too.
Look in the section with all the gizzmo's by the bolts <g>.
Bobby Middleton

"God doesn't play dice".........
Albert Einstein on blind chance
http://www.koyote.com/users/bobm/astro1.htm

----- Original Message -----
From: Steve Walters <swalters@att.net>
To: <astro-photo@seds.org>
Sent: Wednesday, September 12, 2001 7:38 PM
Subject: Re: [APML] Gas Purge for Pentax 6x7


> Lee,
>
> It would be nice to see the photos. I drilled my old 6x7 straight through
> the tripod hole to the light box with no adverse results. Phil Perkins did
> the same. I've since sold the 6x7 but this modification took about 10
> seconds.
>
> Steve...
>
> swalters@att.net
> http://astrophoto.home.att.net
>
> ----- Original Message -----
> From: <leakeysg@netscape.net>
> To: <astro-photo@seds.org>
> Sent: Wednesday, September 12, 2001 8:22 PM
> Subject: [APML] Gas Purge for Pentax 6x7
>
>
> > Know that there has been interest by several people in adding a dry gas
> purge to Pentax 6x7 cameras.  My Pentax was in the camera shop for some
> other repairs, and the repairman pulled the bottom of the camera off this
> morning so we could take a look.
> >
> > There is a cavity between the bottom cover and the bottom of the light
> box.  A narrow ridge, maybe 4-mm wide and 7 mm high, runs along the
> centerline of the bottom of the light cavity in the direction of the main
> axis of the camera.  This ridge lies in line with the tripod threaded
hole,
> and the accessory alignment hole closer to the back of the camera.  There
> are some small circuit boards and other electronics in the bottom of the
> camera attached to the bottom of the light box.  A drilled hole through
the
> alignment hole and into the ridge and into the light box would not
intersect
> any circuit boards or anything else, but would leave some debris floating
> around in the bottom of the camera.  (Some people have added something
tacky
> to their drill to catch the chips.)
> >
> > The tripod hole is different in that there are about 6 small,
individual,
> insulated wires that go across the ridge right above the tripod hole.
These
> wires are not tightly bound, so that one could probably drill through the
> thin aluminum tripod hole, then turn the drill off and sort of push the
> wires out of the way, and then turn the drill on again and drill through
the
> ridge and into the light box.  It might even be hard to drill through the
> wires if one were trying, but...  Not sure how hard it is to get the
bottom
> of the camera off, but will ask the fellow at the shop when I return in a
> couple of weeks.  That would make the drilling easy, which was the route
we
> took.
> >
> > I took a digital camera along to take pictures of the Pentax taken apart
> that would be a lot clearer than my description, but had the wrong type of
> disk in the camera and did not get any pictures.  (Similar to many of
> astrophoto experiences.)  May have an opportunity to take some pictures in
a
> couple of weeks when I go back.  If you would like pictures, send a
private
> e-mail and I'll see if I can get some.
> >
> > Thanks,
> > Lee Dodge
> > San Antonio, Texas
> > leakeysg@netscape.net
> >
> >
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