Re: [APML] Pentax 67 purge port........NOT!<g>

[Tim Povlick <potentate@home.com>]

Bobby Middleton wrote:

> ----- Original Message -----
> From: Tim Povlick <potentate@home.com>
>
> >
> > I was curious about purging so here goes some questions:
> >
> > When one drills either the 67 or 67-II, for daylight use
> > would you have to plug the hole else light will get in?
>
> Mine will have a bit of a leak. A small piece of electrical tape is a fix
> for me.......if I remember it   :-o
>
> >
> > In a desert environment, say  15% humidity is a purge
> > system necessary for hypered film?
>
> Probably not necessary at all for 35mm, but the size of the 6x7 neg makes
> flatness a real issue and moisture is an enemy of flatness. I would bet the
> desert rats will tell you it's necessary. It's definately necessary in east
> TX.
> >
> > If you have some accessory before the camera, say a
> > field flattner that can be drilled, is this an acceptable
> > place to drill?
> >
>
> By all means if you have something in front of the camera I'd use that to
> port in the N2.
>
> > Since oxygen (as well as H2O) seems to be the enemy
> > of hypered film, it would seem a nitrogen purge is better
> > than a dried air purge.
>
> N2 is very easy. And cheap after initial setup. I'd rather use that with
> just a bleed flow instead of messing with a dessicant and air moving system.
> Bobby Middleton
>
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Thanks for the information Bobby.....


Tim


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