With the use of the new <b>H6</b> water-cooled 1000-watt mercury arc lamp, two Polaroids, a new fast film of Weston rating <b>140</b>, and a simple optical system photographs of the fundus of the eye have easily been made without the use of drugs that dilate the pupil.
KATHYRN LOUISE STONE and M. L. POOL, "Fundus Photography without Cycloplegics," J. Opt. Soc. Am. 29, 463-464 (1939)