RE: [APML] How do you N2 Purge an OM-1?

["R. Scott Ireland" <ireland@gate.net>]

Inserting N2 (or dry air) through the camera back (or tripod socket) allows
you to use your camera lenses for astrophotography, in addition to using a
telescope.  Drilling through a T-adapter or off-axis guider will not give
you this functionality.

It seems to me that drilling through the tripod socket (e.g. through the
electronics) is much more difficult than simply introducing the gas (or dry
air) through the back of the camera behind the pressure plate.  I have never
had any problems with this method, nor have I ever had light leakage.  Just
to be safe, I opaqued (wrapped in black, electrical tape) the transparent
gas line for about 3 feet behind the camera body, but I never had any light
leakage even with the transparent tubing.  And, that even includes the "red
light" test - star party folks interested in seeing your setup and walking
up with red lights blazing <g>.

Finally, with this method, for the cost of a spare camera back you are not
"messing" with your camera at all.

Scott

website:  http://www.rsiphotos.com/
email:  ireland@gate.net

> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of Franklin A. Holub
> Sent: Monday, August 26, 2002 10:29 AM
> To: steve banbury
> Subject: RE: [APML] How do you N2 Purge an OM-1?
>
>
>    Seems to me that drilling a port into the T adapter would be a
> good place. At least that way you would only risk a $10 adapter
> and not the whole camera body...
> Frank
> http://www.my-spot.com/astronomy.htm
>
>
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