[WITHDRAWN] Murnaghan infrared filters

[Stevec35 (Steve)]

These are 3 1 1/4" near infrared filters that I used in my first experiments with infrared imaging. Given that I long ago moved to 50 mm filters they aren't much use to me any more.

Filter 1 passes wavelengths longer than 7nm and blocks everything else
Filter 2 passes wavelengths longer than 7.8nm and blocks everything else
Filter 3 passes wavelengths longer than 8.3nm and blocks everything else

Using these filters together you have the possibility of doing colour infrared images although I only ever used them for monochrome.

$60 for each filter or $175 for all three plus postage

[Atmos (Colin)]

Just for clarification do you mean 700, 780 & 830nm or moving into the deeper band of 7 micrometers (um)? Basically near or mid infrared.

[Stevec35 (Steve)]

Originally Posted by Atmos

Just for clarification do you mean 700, 780 & 830nm or moving into the deeper band of 7 micrometers (um)? Basically near or mid infrared.

Sorry Colin - don't know what I was thinking. Dementia must be catching up. You are correct of course. Should be 700, 780 and 830nm. For my 6303 sensor the sensitivity drops to zero at about 1100nm (1.1 microns).

[Stevec35 (Steve)]

Now asking $40 per filter or $110 for all three

[Andy01 (Andy)]

These are mounted 1 1/4"?
I'll take one to try. Pm you tonight