Hey PhotoDad,

Interesting article. And moonlight is definitely required to get this effect.

For those that may be interested, the sun shines at magnitude -26. The moon shines between magnitude -10 to -13, depending on how full it is. Each magnitude represents an increase (or decrease) in brightness of 2.5 times. So basically, the sun is about 100 times brighter than the moon.

Also of note, while reciprocity failure will shift the colors on most films, some are noted for their ability to hold a true color. Provia 100 has long been a favorite of astronomers for it's lack of color shift.

While you're experimenting, try using different films, and use print film as well as slide film. You'll get some interesting results.