"Szczepan Bialek" wrote in message
.. .
Infrared and UV light do not pass through glass.
For infrared you must use the NaCl. And for UV the quartz.
"It is the wave length dependent."
S*
Szczepan, this news that "Infrared and UV light do not pass through glass"
should be passed to Canon and Nikon and other manufacturers of digital
cameras who fit infrared filters onto their sensors. They do not know that
infrared will not reach the sensor, having been stopped by all the glass in
the lens.
According to Wikipedia, glass is approximately 75% SiO2. Quartz is SiO2.

Regards, Ian.