Great Gray Owl Great Gray Owl, Duluth, MN, January 17, 2025Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x teleconverter; 700 mm; ISO-1600; f/10; 1/500 sec. This page is for the Great Gray Owl (Strix nebulosa). Great Gray Owl, Duluth, MN, January 17, 2025Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x teleconverter; 700 mm; ISO-6400; f/10; 1/1000 sec. Great Gray Owl, Duluth, MN, January 18, 2025Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x teleconverter; 700 mm; ISO-1000; f/11; 1/1000 sec. -1 exposure bias. Great Gray Owl, Tofte, MN, January 19, 2025Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x teleconverter; 700 mm; ISO-1600; f/10; 1/1000 sec. Great Gray Owl, Tofte, MN, January 19, 2025Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x teleconverter; 700 mm; ISO-1600; f/11; 1/1000 sec.