On Sunday, June 16, 2013 9:42:52 AM UTC-7, Dan Marotta wrote:
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

No problem with my 302 with all polarized glasses I used. Either your glasses or your 302 polarized wrong.

Ramy