RE: [APML] Moon comparison with 3 films: eclipse prep

["Jeff Ball" <jeffball@zoominternet.net>]

Hello Chris,
Thanks for the info and the links.  Chris, how would you characterize those
lunar eclipses with regards to "lightness?"  I know one was around the Mt.
Pinitubo (sp?) eruption.  Thanks for the help.

BTW, I don't know if I agree with some of the advice in the May issue of Sky
and Tel on how to shoot the eclipse.  I like the idea of multiple exposures
on one frame of film to capture the eclipse sequence.  (Seems like we could
do this digitally, either digicam or scanned film, without taking the risk
of exposing only one frame for the entire night.)  The author, Roger
Sinnott, recommeds a wide angle lens (not sure if he is continuing his
afocal discussion) and exposing the frame every 5 minutes.  When I run this
sequence scenario in The Sky, regardless of the lens used, you need more
than 5 minutes for the Moon to clear its previous location and get a new
isolated Moon in sequence.  Am I missing something on this technique?
Thanks.

Jeff Ball
www.astro-photography.com

-

As far as predicting the brightness of the eclipse.  A lot depends on
paticulate matter and clouds in the atmosphere.  Since there has not been a
major volcanic eruption lately, I would guess the atmosphere is fairly clear
and the eclipse will be on the light side.  Another factor is how deep into
the umbra the Moon travels.  With the upcoming eclipse, I think it travels
more towards the edge of the umbra, again, pointing towards a lighter
eclipse.

Here are some of my lunar eclipse shots from past years if you're
interested.

http://www.abmedia.com/astro/planets/eclipse.html

http://www.abmedia.com/astro/planets/lunar-1989.html

http://www.abmedia.com/astro/planets/moon2.html

Chris

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