spotlighting and bird's eyes

[Andrew Taylor <>]

On Sat, May 10, 2008 at 06:06:32PM +1000, Michelle Plant wrote:
> I cannot think of the name of the filters,
> but they must be fairly common these days... to provide some 
> protection for critters when spotlighting...

Red filters are commonly used on torches/spotlights to reduce disturbance of
mammals and sea turtles.  But turtles and many mammals have less visual
sensitivity in the red part of spectrum than we do.  But I doubt it will
work for most birds - they have broader visual sensitivity than we do.
Unless you go to a night-scope and infra-red illumination.

Andrew