Thermal for scouting, green/red light for shooting?

This high quality cut off filter specs here:

FEL0850_Transmission.gif


Guess this one is 80% transmissive at what we want suppresses everything else.
 
Yes sir, you got it all figured out. Looks good on paper. Like I said earlier, you have a lot of ideas and plenty of enthusiasm, so again best wishes for a successful endeavor. Don't forgot to let us know how it turns out when you get it all set up.
 
Last edited:
Originally Posted By: hunter4funFor a laser I would narrow bandpass +/-2nm. But for LED the spectrum is given which shows from 825 to 1000nm so a 850nm side pass should give you 90% of all usable light and block the red you don't want. Yes you will lose 10% but it's not that bad esp while suppressing the red down to 0.001%

Unless the camera really isn't picking up 940nm and only the red light is what's actually illuminating it then I don't see how this won't work.

Science of the output spectrum from the led and the filter's transmission/suppression easily give the correct result...

Use the search PM search engine at the top of the page and you will find hundreds of threads related to what you are trying to do. Many of us have been here for years trying to put together cost effective night vision rigs. Lots of us started out with scan lights and shooting lights and progressed through all the upgrade steps.......Gen 1 ....Gen 2 ....Gen 3....Digital.....Thermal.

There are a lot more options now than just a few years ago so that is in your favor. There are many digital products and emitters to choose from but in the end you will learn what we all have learned. You get what you pay for with regard to night vision technology and the best advice I can offer is to save your money until you can afford a quality product of whatever you decide to use. You more than likely will waste a lot of time and money trying to beat this dead horse one more time.
 
For my usage theres always a place for Gen 3 but mainly for spotting and shooting I use thermal. I do have IR lasers and can shoot that way but much prefer the thermal scope for several reasons. The gen 3 is awesome for walking around and also driving blacked out.
 
Originally Posted By: hunter4funFor a laser I would narrow bandpass +/-2nm. But for LED the spectrum is given which shows from 825 to 1000nm so a 850nm side pass should give you 90% of all usable light and block the red you don't want. Yes you will lose 10% but it's not that bad esp while suppressing the red down to 0.001%

Unless the camera really isn't picking up 940nm and only the red light is what's actually illuminating it then I don't see how this won't work.

Science of the output spectrum from the led and the filter's transmission/suppression easily give the correct result...


Unfortunately, the IR output from an IR LED looks more like a normal curve, with a 95% confidence interval that you will not be able to use it with a band pass filter on it....

Like I mentioned previously, band pass filter works great dimming the output of a monochromatic pure beam IR laser but doesn't work as you are planning with an IR LED.
 
Originally Posted By: SkyPupOriginally Posted By: hunter4funFor a laser I would narrow bandpass +/-2nm. But for LED the spectrum is given which shows from 825 to 1000nm so a 850nm side pass should give you 90% of all usable light and block the red you don't want. Yes you will lose 10% but it's not that bad esp while suppressing the red down to 0.001%

Unless the camera really isn't picking up 940nm and only the red light is what's actually illuminating it then I don't see how this won't work.

Science of the output spectrum from the led and the filter's transmission/suppression easily give the correct result...




Unfortunately, the IR output from an IR LED looks more like a normal curve, with a 95% confidence interval that you will not be able to use it with a band pass filter on it....

Like I mentioned previously, band pass filter works great dimming the output of a monochromatic pure beam IR laser but doesn't work as you are planning with an IR LED.

Lots of wisdom here....
 
Back
Top