Re: [APML] Film Choice for Total Lunar Eclipse (warning! OT)

["Stuart Heggie" <stuart.j.heggie@sympatico.ca>]

Wade, this is very helpful, thanks! Now we must all do our utmost to get the clouds to go away.
Naturally it was clear as a bell last night!
Stuart
----- Original Message -----
From: "Thomas W. Earle" <twade@bmi.net>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Monday, October 25, 2004 10:19 PM
Subject: RE: [APML] Film Choice for Total Lunar Eclipse (warning! OT)


> Stuart,
>
> You should have no problems exposing at ASA 1600.  Do you have a
> drive that compensates for the rotation of the Earth.  Better yet,
> if you have a Lunar rate, use it.
>
> If you have no clock drive, here are the longest exposures you can
> take according the Michael Covington:
>
> 350-700 mm 2 seconds
> 700-1500 mm 1 second
> 1500-3000 mm 1/2 second
>
> For critical work (i.e. no blur), divide these times in half.
>
> I'm not sure what f-ratio you'll be using; however, at f/5.6 a
> relatively light total eclipse, is around 1/2 second at ASA 1600.
> For a dark eclipse, you're talking 9 seconds.  The cool thing about
> using a digital camera is you can experiment with your exposure
> times on the fly. This allows you to find the perfect exposure.  We
> who use film, have to hope and pray.:)
>
> Good luck,
>
> Wade
>
>
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