Re: [APML] Hypering TP

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

Ooops, I meant this to go to Bobby Middleton....but anyone who cares to
respond is welcome....clicking away too fast here...

Steve...

----- Original Message -----
From: "Steve..." <swalters@att.net>
To: <astro-photo@seds.org>
Sent: Saturday, March 09, 2002 10:12 AM
Subject: [APML] Hypering TP


> Bobby,
>
> I'm back to work on hypered techpan and have a question.
>
> Because I have a vacuum film back, I have to remove the paper from the 120
> format TP before shooting. The last time I attemped hypering, I removed
the
> paper BEFORE hypering and my friend, Warren Keller, hypered it in his
> Lumicon 300 chamber. The film did not hyper evenly and had "bars" across
it.
> These bars ran across the width of the film were evenly spaced down its
> length. The distance between bars was exactly the circumferance of the
> spool. I decided this was caused by having removed the paper and letting
the
> emulsion touch the mylar. I had rolled the film back up pretty tightly
after
> removing the paper.
>
> Now, I have my own Lumicon 300 chamber. I decided to leave the paper on
when
> hypering and then remove it before going to the field. But when I put the
> film in the chamber, I noticed that the central post on the 300 chamber
> presses a little against the film roll. It's not tight but there is some
> small pressure. So I wonder if this could be causing the uneaveness.
>
> So, (finally) my questions:
>
> Does your 300 chamber show this problem? (central post pressing against
the
> 120 film roll in its middle section. Or maybe you have a larger chamber)
>
> Do you hyper with the paper backing left on?
>
> Any insights?
>
> Steve...
>
>
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