Re: [APML] Gas Purge for Pentax 6x7

["Steve Walters" <swalters@att.net>]

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
>
>
> __________________________________________________________________
> Your favorite stores, helpful shopping tools and great gift ideas.
Experience the convenience of buying online with Shop@Netscape!
http://shopnow.netscape.com/
>
> Get your own FREE, personal Netscape Mail account today at
http://webmail.netscape.com/
>
>
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>