Wow! Lots of interest in this topic!

One of our members who has made a close study of optics, recommends a
very lightly colored polaroid for gliding. Particularly interesting
points being:

* a dark colour simply causes the eye to open wider to let in an
appropriate 'amount' of light. When opened wide the eye is very
susceptible to stray light coming from the side of the lenses, and the
depth-of-field is dramatically reduced. Keeping the eye small ensures
that maps, instruments and long distance focussing are likely to be
much easier.

* be certain that the lense stops UV (some offer little resistance!).
The lenses should be large in size to maximise the UV blocking.

* Sure, polaroid may have a problem under some canopies . . but this
will be well known for that particular craft.

Question for those advocates of the SunTigers (unlikely to be
available here): Have you compared them to polaroids with similar
colour?

(perhaps SunTigers are available as polaroid too?)

Cheers,

Jim Kelly
Australia.