Moon almost invisible, especially at mid-totality. Details distinguishable only with difficulty. Deep red or rust-colored eclipse. Very dark central shadow, while outer edge of umbra is relatively bright. Umbral shadow usually has a bright or yellow rim.
Umbral shadow has a bluish, very bright rim.
The assignment of an 'L' value to lunar eclipses is best done with the naked eye, binoculars or a small telescope during totality. Use the descriptions above and select the one that best fits the Moon's appearance. To photograph the Moon in total eclipse, you choose the exposure with the corresponding 'L' value from the Lunar Eclipse Exposure Guide . You should bracket two or three stops over and under the recommendation. The Lunar Eclipse Photo Gallery has more examples of lunar eclipse photography.