Photograph of a portion of the moon taken with the 100-inch Reflector at Mt. Wilson Observatory; equivalent focus = 134 ft. (The large crater is Archimedes.)
Journal of the Royal Astronomical Society of Canada.
Dome of the 100-inch Reflector. (From the Publications of the Astronomical Society of the Pacific.)
View of the 100-inch Reflector at Mt. Wilson Observatory. (From the Publications of the Astronomical Society of the Pacific.)