Bob Talbot <snapper@st-abbs.fsnet.co.uk> writes: > > The phase doesn't matter if the moon itself is your subject; the > > brightness of the bright portion is essentially constant (the main > > variable is the clearness of the air between you and it, and that > > doesn't vary with the phase). > > > > I learned this one from an Ansel Adams book. There's a rule of thumb > > for exposing an object in direct sunlight -- the "sunny 16" rule. You > > give it 1/ASA at f16, for whatever ASA film you're using. > > > > Well, the moon is an object in direct sunlight. > > > that theory is oft repeated but sadly it is no where near that simple. > > http://www.calphoto.com/moon.htm > 1/100 af f16 tends to give very dark exposures of even the full moon. > 1/100 @ f11 (or even f8) is more likely to give good results. The moon is darker than we think it is; makes sense since we almost always see it against a black background. > As to the brightness being independant of phase ... > www.roboticobservatory.com/jeff/lunar/obs_tech/albedo.htm > > the moon does not appear to act anything like a lambertian surface ... Very cool, thanks. -- David Dyer-Bennet, dd-b@dd-b.net / New TMDA anti-spam in test John Dyer-Bennet 1915-2002 Memorial Site http://john.dyer-bennet.net Book log: http://www.dd-b.net/dd-b/Ouroboros/booknotes/ New Dragaera mailing lists, see http://dragaera.info
