Greetings Sergio,
Thom Hogan has a great guide to night photography in his book, "The Nikon
Field Guide." I have no connection to Thom or his book, but have tried his
guide & have found it to be accurate.
According to Thom, using ISO 100, Star trails should be shot at maximum
aperture with a 20 minute exposure. Full moon: f/11 @ 1/125 second, Half
moon: f/11 @ 1/30, Crescent moon: f/11 @ 1/4. Scenes lit by full moon
(minimum exposure): f/2.8 @ 3 minutes, (maximum exposure): f/2.8 @ 16
minutes, Scenes lit by quarter moon: f/2.8 @ 15-30 minutes, Scenes lit by
crescent moon: f/2.8 @ 30-60 minutes.
Don't forget reciprocity effects (check your film's guide sheet). Exposures
longer than 30 seconds result in an oblong moon with blurred or washed-out
details.
I recently made some exposures of a full moon using this guide & they all
came out well. I've also taken moon-lit scenes using similar exposures
successfully. I hope to reproduce a couple of the moon-lit scenes & add
them to my web site soon. They're B&W, so they're not as dramatic as they
might be in color, but anything's better than nothing.
Give these a try & let us all know how they turn out.
Best regards,
John
___________________________
John Wilkinson
Okie Shutterbug
http://home.earthlink.net/~jrwilk
Tulsa, Oklahoma, USA
