SUN GLASSES

After trying a friend's Eagle Eyes (As seen on TV!!!), I found them to
improve detailed vision, especially spotting very thin dust devils. So I
bought a pair with built in readers.

They're great! I used them to take my wife for a ride in a friend's
DG-500m-22 and they were flawless. Yesterday, when I pulled down the canopy
of my LAK-17a, I found the screen of my CAI-302 to be totally black. At
first I thought it was due to the heat but, raising the glasses, I saw the
problem was with the misaligned polarization of the 302 screen with the
glasses.

I wonder if the glass in the 302 can be rotated 40-90 degrees...


"Eric Greenwell" wrote in message
...
John Galloway wrote, On 6/14/2013 7:08 AM:

Polarised sunglasses should genarally be expected to have
vertical polarization because the whole point about reducing
glare from water surfaces etc is that the light reflected of the
surface to the eye tends to be polarised horizontally.

On another topic - genuine question - do polarised lenses made
without a UV absorbing tint, and without a UV absorbing lens
material such as polycarbonate, reduce UV transmission more
than in proportion to the reduction in general light
transmission?

Your canopy filters out most of the UVB, as will almost every pair of
sunglasses, regardless of their tint or polarization. Plastic or glass
that passes significant amounts of UVB is "special" stuff that costs more.
UVA transmission is more variable, as it takes some effort to filter it
out, so if you want to block it, look for a pair that specifically claims
to do so.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email
me)
- "Transponders in Sailplanes - Feb/2010" also ADS-B, PCAS, Flarm
http://tinyurl.com/yb3xywl