Re: [APML] Film Hypering

["Sieg" <siegburg@whooshnet.com>]

Thanks for the info.

I think i'll make a unit rather then buy one, and use a hand actuated pump for the time being. I will use a good chamber and hook up some 1/2 way decent monitoring equipment, it should cost about the same as buying it (as I will have to pay duty/taxes/shipping to get it into Canada anyways). But if I can find a good deal on an electric one I may grab it.

 

Caution; high-vac for color films is a pretty much uncharted path with only one APML member giving it a try that I know of (Philip Perkins). He had problems with un-even hypering IIRC

 

Sounds to me like the film base itself is degassing in the high vacuum (along with everything else in the vessel and the vessel itself) and contaminating the film somehow.

 

As far as the wife/girlfriend thing goes...was just a little joke....for now.

 

 

 

----- Original Message -----

From: Sieg

To: astro-photo@seds.org

Sent: Friday, September 21, 2001 12:46 AM

Subject: [APML] Film Hypering

After ordering the parts for my purge system I have decided to take the plunge and get a hyper kit together also.

 

Hypered film is simply better. 

 

From what I have gathered hypering films is as much of an art as a science.

 

It seems that the Lumicon Hyper kits are a pretty good deal compared to buying the individual components ones self. But are the hypering conditions with the Lumicon kits repeatable with any expectation of reasonably high accuracy (temperatures, pressures etc)? I am considering getting some kind of vacuum pump and a good chamber. Can anyone suggest a good model pump (Im looking at the Welch model 8803 or 1400)?

 

Is it better to subject the film to a lesser vacuum but for a longer period, or a high vacuum for a shorter period, or does it even matter lol. Would not the actual film base outgass at high a high enough vacuum, denaturing it somehow?

 

I have to admit having a bell jar hooked up to a vacuum pump downstairs in my "lab" would make me feel like Dr. No or something, probably a guy thing. Although my wife, not to mention my girlfriend are starting to think im really weird buying all this stuff.

 

Or am I an idiot, overthinking all of this and should just go out and get me a Lumicon model?