Purple Martin Purple Martin, Colleyville Nature Center, Colleyville, TX, May 8, 2022Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x Teleconverter; 700 mm; ISO-1600; f/10; 1/1000 sec. This page is for the Purple Martin (Progne subis). My first photographic evidence occurred on May 8, 2022 at the Colleyville Nature Center. Purple Martin, Colleyville Nature Center, Colleyville, TX, June 18, 2022 Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x Teleconverter; 700 mm; ISO-160; f/10; 1/500 sec. Purple Martin, Fort Worth Nature Preserve, Fort Worth, TX, July 2, 2022Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x Teleconverter; 700 mm; ISO-1600; f/10; 1/2000 sec. Purple Martin, Colleyville Nature Center, Colleyville, TX, May 4, 2024Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x Teleconverter; 700 mm; ISO-1000; f/11; 1/2000 sec. Purple Martin, Oak Grove Park, Grapevine, TX, July 27, 2024Canon EOS R5 with Canon 100-500 mm L-series lens with 1.4x teleconverter; 700 mm; ISO-1000; f/11; 1/800 sec.