Re: WTS/WTT: 20km Laser Rangefinder. Russian labeled Newcon Optik LRB-20000A
Here's a triptych, close-up view of the LPR-1 Soviet era laser rangefinder.
I've tested it on an antenna up on a mountain some 15 km. (~ 9 miles) away. After the first ranging, I paced 5 steps back; the distance decreased by 5 meters. Paced back the original distance & - yes - the distance once again increased by 5 meters.
I've ranged deer easily out to 1000+ yards; fur presents absolutely no problem. After that distance, it's hard to know whether you're measuring off of the deer or its surroundings. After all, this thing was made to range tank-size vehicles.
Using it handheld is a bit hard. The trigger buttons up top are hardly what you'd call a hair trigger. This results in a shaky reticle picture that won't give you reliable results on small targets at great distances. The LPR-1 is best used either in prone position or - better still - with its tripod & remote cable release.
For the technically minded, the laser is a Q-switched Nd:Yag unit that puts out extremely short pulses in the mega-watt range - this thing ain't eyesafe. It works on the "time of flight" principle; light travels at a known speed & using extremely short, compressed pulses of laser light, distances are determined from the time it takes the beam to reach the target & bounce back.
I've had mine for over 20 years now & it still works perfectly. Only problem I've had was a broken switch (see photo) & of course the old NiCad batteries.
Anyhoo, enjoy the pics!