Eye on Nature: ‘Is there a ... This one was having a rest on a dry boat, where it felt safe enough from passing humans. Please submit your nature query, observation, or photo with a location, ...

Under the most favourable conditions, the smallest amount of light which the human eye can detect is 58–148 quanta, representing an energy of 2–6 × 10-10 ergs.

The de Young's "Errand of the Eye" seeks to correct that historical blind spot and bring Mandel's work back into the light. {sbox} The Errand of the Eye: Photographs by Rose Mandel: June 22-Oct. 13.