The Porter Turret Telescope
The Porter Turret Telescope was constructed in 1930 by the Springfield Telescope Makers. Porter, who had endured more than his share of winter cold on polar expeditions early in his career, invented a design that allowed the observer to remain indoors and comfortable on the coldest winter nights.
Date: August 13, 2015
Location: Stellafane Convention, Springfield, Vermont
Optics: Canon EF 8-15mm f/4L Fisheye USM
Camera: Canon EOS 5D Mark III
Exposure: 30 sec, f/4, ISO 3200
