Specialist portrait lenses tend to have even wider maximum apertures (from f/1.4 to f/2.8) in order to blur backgrounds further. Learn more: The A to Z of Photography: Aperture 3.

Lives in Motion features 51 stories of migration from the National Portrait Gallery's (NPG) London collection. The free display, ranging from the 11th Century through to the present day, opens at The ...

This article was originally published with the title “ Motion-Picture Portrait Photography ” in Scientific American Magazine Vol. 119 No. 2 (July 1918), p. 28 doi:10.1038 ...