(meteorobs) Re: Long Exposures/Reciprocity

• To: astro@store-forward.mindspring.com, meteorobs@latrade.com, TPrinty@aol.com, jrendtel@aipdot de
• Subject: (meteorobs) Re: Long Exposures/Reciprocity
• From: Brian Halbrook <bhalbroo@mich.com>
• Date: Wed, 16 Apr 1997 15:08:29 -0400
• In-Reply-To: <970416111655_-435214111@emout01.mail.aol.com>
• Reply-To: meteorobs@latrade.com
• Sender: owner-meteorobs

At 11:17 AM -0400 4/16/1997, GeoZay@aol.com wrote:
>Now when I took the black cardboard away, does the film start out
>again as if it was 800 ASA again? If so...could I do this every 10 minutes
>for about 30 seconds to increase the overall effectiveness of the film for
>long exposures?

No...you would have to "take back" the photons of light that the film has
already been exposed to. And there certainly wouldn't be any point in that!

Brian Halbrook,
<mailto:bhalbroo@mich.com>
<http://www.mich.com/~bhalbroo>
Accent Photo, P.O. Box 761, Marquette, MI 49855

• (meteorobs) Long Exposures/Reciprocity
• From: GeoZay@aol.com

• Prev: Re: (meteorobs) meteorite fallen on a car in France
• Next: Re: (meteorobs) Long Exposures/Reciprocity
• Index(es):
  • Main
  • Thread