On May 24, 3:54*pm, Phil Hobbs
wrote:
N_Cook wrote:

Or at least translucent to visible. Hopelessly undiscriminating IR encoder &
decoder on a piece of kit but need to see the LED segment display , which
inconveniently has the IR Rx within it.
I've tried loads of normal materials like polythene,perspex, glass, mica,
silicone rubber.
I know black polythene will transmit the IR of PIR units and block visible
but there is more seperation of f there

Short pass filters are harder to make than long pass. *You might try
Edmund Optics.


Does a "Type A" filter signify anything useful? The price at American
Science and Surplus is right:

http://www.sciplus.com/category.cfm/...1/category/191