Don B. said -

<cut>

>I think it is reasonable to presume that night vision is less effective
>than day vision, no matter how impressive night vision might be. As
>a geek, I think in terms of information loss, i.e. fewer photons
>flitting about, which after all (as a geeky photographer) is why
>photography is difficult when there's no light.

Reasonable only if owls' retinas are structured similarly to humans
which is your assumed presumption here. It is quite possible that a
certain difference in the ratio of rods to cones could lead to greater
contrast acuity in the dark rather than in the daylight. Remember the
old pan-boreal aboriginal legends about Boreal Owls being "blind" during
the daytime. Perhaps someone with biological info on the optical
characteristics of owl vision could inform us further.

- Jack



Jack Bowling
Prince George, BC
CANADA
jcbowling at mindlink.bc.ca