which lense?

hey guys, im new here...youll see from this question. ive been a lurker for a long time though...mostly looking into building my own laser, but this is for somethign different.

heres the deal:
I want to mount an IR torch to my air rifle so that I can see at night, well i have found the torch that I want but I need to find out which lense to put on my scope so that I can see the IR light.

NVMT IR Flashlight - Yukon

thats the torch; IR power: 100 mW, IR wavelength: 805nm

so yes, which lense do i need so that I would be able to see the IR light?


also, while im at it...that torch runs around $100, is there another one that yall would recommend? it cant be too focused but I would like to be able to see out to around 80 yards or so

thanks and sorry

To see IR you'd need an IR camera, a simple lens won't change the invisibility to the human eye for IR. Most cheap nightvision stuff uses a CCD or CMOS camera sensitive up to ~1100nm and an IR light source. This would work.

A simple IR light source doesn't have to be expensive, but it would have to survive the recoil and have a proper mount and stuff, so it won't be cheap anyway.

you HAVE to have an "electronic lense?" man, i was hoping you could put a lense and filter it and change the wave in some form.....well, scratch that idea.

what about a high powered unfocused green laser?

why a laser?

If you can put up with the speckle and dust spots, then that would be perfect.

because this is what i was originally thinking...but theres got to be a cheaper way than $300

http://laserpointerforums.com/f52/laser-genetics-genisys-nd3-large-pics-47421.html

ND3 Green Laser Designator for Military, Law Enforcement and EMT | Laser Genetics

Our eyes can't see IR, so no matter how much IR the lens focuses into your eye, you won't see it. You need an electronic imaging sensor, like those in digital cameras, to "see" IR.

You can see this in action if you take your camera phone and point a TV remote at it. Looking at the remote and pressing a button you won't see anything unless you look through the camera.

Been down a similar road so can comment on my own experience. My objective was to to paint a target at 500 yards and beyond. 100mw green w/ adjustable focus did great when unmounted , and using a spotter scope. The tap switch was changed to a surefire and makes a huge difference. One sub-second tap and your target should be vapor? Now optics mounted add recoil and as mentioned below from my expedience most rifle mounts alone begin to dismantle ( depends on the platform your using). I used an AR-10 .308, as compared to others has a much less recoil with buffer etc. Nonetheless every laser i tried was working fine but no longer attached to the firearm.

For spotting its a fantastic concept. Most overseas companies have little or no experience building a housing that can sustain firearm recoil. There are a few US and Isreali companies that specialize in optics and laser applications, and very expensive and provide limited civilian use items.

If your willing to pay for an IR configuration contact Crimson Trace and Trijicon. Not much info on the site you need to call and articulate what your looking for.
The laser should be the last item on your list. At 80 -150 yards you really dont need a laser . See Trijicon TA-55, no batteries and it will illuminate a target at 600 yards at night.