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

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

One small tip which has not been mentioned.

It's not a bad idea to advance an extra frame between exposures so that each
shot is with a segment of film that has been completely inside the cassette.

While certainly not foolproof, it's just a little extra measure of
protection against humidity/film curl.  Since we end up throwing away most
of the film anyway, there is generally plenty of extra film available for
this procedure.

I do this as a matter of general practice, even when using N2 purge.

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 steve banbury
> Sent: Wednesday, August 28, 2002 6:32 PM
> To: astro-photo@seds.org
> Subject: Re: [APML] How do you N2 Purge an OM-1?
>
>
> Thanks Jeff!
>
> I'm going to hold off on N2 purge for a bit longer and try not to mess up
> the resale value of anything as you suggest.
>
> My plunge in the direction of N2 purge was precipitated by trailed images
> taken over  2 consequetive nights last new moon.
>
> On each night I used 2 refractors (each with its own OM-1) mounted to a
> common plate, and guided by an STV efinder also bolted to the plate not
> just with the standard 1/4-20 tripod bolt hole provided by SBIG, but an
> additional bolt as well. One refractor was equipped with hypered LE400 (a
> new roll each night), and the other was equipped with E200 (same roll both
> nights). One hour images of the same object shot thru both refractors on
> the 2 consequetive nights exhibited virtually identical trails.
> The trails
> appear to be only in RA, and are somewhat dumbell shaped as if the mount
> had oscillated between 2 alternate positions.
>
> The fact that the E200 images exhibit the same trails as those obtained
> from 2 different rolls of hypered LE400 leads me believe there is another
> factor here and purging with N2 wouldnt have helped.
> Of course I still don't know what caused my problems....   :^{
>
> Steve
>
>
> At 02:34 PM 8/28/02 -0700, Jeff Allen wrote:
> >Steve,
> >I don't think I would drill holes in anything you
> >might want to list on Astromart later. (ie. re-sale
> >value of a telescope) I went through the tripod
> >adapter (ala Phil Perkins) on my Canon F-1.
>
> snip
>
> > I found some hollow threaded thingamajigs at Lowe's or Eagle
> Hardware. Or
> >maybe it was Home Depot. I believe it was Bobby
> >Middleton mentioned them last year in a thread.
> >
> >Jeff Allen
>
>
>
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