Re: [APML] Pre-Flashing Slide Film

["Mike Cook, AF9Y" <mwcook@concentric.net>]

I did not think about that.  I could overcome it by doing
a 90 degree phase shift and using a second flourescent
light.  Not sure about how the strong emission lines will
change the final result.

Date sent:              Thu, 25 May 2000 01:26:46 -0400
To:                     astro-photo@seds.org
From:                   Jerry Lodriguss <jml@astropix.com>
Subject:                Re: [APML] Pre-Flashing Slide Film
Send reply to:          astro-photo@seds.org

> 
> 
> Flourescent lights are going to probably give you inconsistent results.
> Not only because of the strange emission lines and colors, but they
> flicker, so your short exposures may be all over the place.
> 
> You probably should try to use 5,000K light or you may get a color shift
> in the final astro picture on a frame that you have pre-flashed.
> 
> Jerry
> 
> 
> 
> 
> At 10:13 PM 5/24/00 -0500, you wrote:
> >I'm taking some test pictures tonight in an attempt to establish
> >approximate pre-flashing periods for E100SV film.  Here's what
> >I have setup:
> >
> >   - White matt board brightly illuminated with cool-white
> >     flourescent light
> >
> >   - Camera set 12" away without lens shows 1/160 as the
> >     normal exposure
> >
> >   - Planning on the following exposures:
> >
> >      1/160, 1/320, 1/500, 1/640, 1/800, 1/1000, 1/1250, 1/1600, 1/2000
> >
> >Any other ideas before I remove the film?  I will have it developed
> >tomorrow and hope to use the results for preflashing some astophotos
> >tomorrow night.
> >
> >
> >
> >Mike Cook, AF9Y
> >http://www.webcom.com/af9y
> >mwcook@cris.com
> >
> >
> >
> >
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> 
> 
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> http://www.astropix.com
> 
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> 
> 
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Mike Cook, AF9Y
http://www.webcom.com/af9y
mwcook@cris.com




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