Gregorian Reflector Telescopes with Speculum mirrors - Nairne, London
Optics Museum, College of Optical Sciences
The University of Arizona
Tucson, AZ, USA
2018-02-20 9:45:52 AM
Canon EOS 6D, f/4 @ 24 mm, 1/125, ISO 12800, No Flash
Joseph A. Carr www.JoeCarr.ca
