Long Range Laser Rangefinder Test

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#1)  Long Range Laser Rangefinder Test

Postby Matt Markworth » Sat Feb 20, 2016 10:49 pm

NTS,

I did some long range tests on my laser rangefinders today. The high winds made it difficult to hold the units steady (should've used a tripod), but I still got some meaningful results.

Six locations were selected perpendicular to the target, which was a white garage door.

The two farthest locations were outside of the range of the Nikon 440's.

The four farthest locations resulted in a round number for the Trupulse 200 measurement. One of the them is listed as 408/409 meaning that the measurement kept bouncing back and forth between those two numbers for that measurement. The Impulse 200LR measured 408.4M at this location, so it makes sense that the Trupulse 200 couldn't "decide" between the two.

Since the Impulse 200LR was handheld, there was a little bit of variance in each firing of the laser, so I rounded it off to the nearest tenth of a meter.


All measurements are in meters:

               
                       
long range test.JPG
                                       
               


Takeaways

- I was pleased that the Impulse 200LR and Trupulse 200 measurements were very close.

- My Nikon 440's shoot a little long at long ranges, and this test validates that previous finding.

- Next time I'll put the Impulse 200LR on a tripod, which should create a repeatable number that doesn't need rounding. This will also allow me to ensure that the point of measurement of each unit (Trupulse 200 is at the tripod mount and the Impulse 200LR appears to be at the front of the unit based on indoor testing compared to a tape measure) is taken into consideration.

Matt

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#2)  Re: Long Range Laser Rangefinder Test

Postby ElijahW » Sun Feb 21, 2016 1:04 am

Mark,

Cool test.  My 440 also seems to shoot long, though I haven't tested it over about 60 yards.  At that distance, it was about .5 yards long, compared to a tape measure on a flat surface.  I need to run another test at some point, and I'll make sure to use a longer distance when I do.  Thanks,

Elijah
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#3)  Re: Long Range Laser Rangefinder Test

Postby Will Blozan » Sun Feb 21, 2016 12:03 pm

Matt,

Impressive tightness there. Do you have plans to use a tree trunk or sprig next?

Will
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#4)  Re: Long Range Laser Rangefinder Test

Postby Matt Markworth » Sun Feb 21, 2016 1:38 pm

Will,

Yep, definitely. There's a nearby park where I can get up to about 700M of clearance on level ground. There's a maple at the edge that I'll probably use for a trunk and twigs.

Matt

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#5)  Re: Long Range Laser Rangefinder Test

Postby Don » Sun Feb 21, 2016 4:37 pm

Even on a calm day that would be a challenge...using tripod I assume?
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#6)  Re: Long Range Laser Rangefinder Test

Postby Matt Markworth » Sun Feb 21, 2016 7:35 pm

Don,

Yep, I'll definitely use a tripod next time for the smaller targets. I'll probably switch into feet as well and see if the Trupulse 200 can provide a repeatable result in feet at the really long distances.

Matt
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#7)  Re: Long Range Laser Rangefinder Test

Postby ElijahW » Sat Mar 05, 2016 6:42 pm

NTS, Mark,

This morning I ran a quick distance test on my Nikon Prostaff 440. Using a tripod for stability, I shot the laser at a tree ID plaque from distances of 40, 60, and 77 yards.  In the field, I very rarely shoot anything over 70 yards, so this test should be very useful for my purposes.  Moving forward towards the click-over point between 40 and 40.5 yards, I used a plum line from the center of the rangefinder to a point on the ground, and checked the distance using a 75' metal logger's tape.  Assuming the click-over point is at 40.24, 60.24, and 77.24 yards (I don't know how good this assumption is), here are the actual distances I recorded:

Laser display (Yards)    Tape distance (Yards)

40                                          39.7
60                                          59.6
77                                          76.5

Adding a click-over distance of .24 yards, my conclusion is that the 440 consistently shoots longer than the actual distance:  40 yards at 39.46 yards, 60 yards at 59.36 yards, and 77 at 76.26 yards.  

Please correct me if you catch any mistakes in my thinking.  Remember, this is only one test, with one instrument.  Results may vary.

Elijah
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#8)  Re: Long Range Laser Rangefinder Test

Postby Matt Markworth » Sun Mar 06, 2016 7:52 am

Elijah,

Very cool! I'm continually amazed at the quality of the laser in the 440. I recently picked up a second one and was surprised that they can now be found in the range of $60 to $80 with a bit of patience. The supply in the used market doesn't appear to be drying up, although without new ones being made it's bound to dry up sooner or later.

I ran similar tests on my first 440 and came up with correction factors at click-over for various distances. As distances increased, the correction factor also increased. I think that others have found that their particular unit has a consistent correction factor over various distances. My correction factor isn't the same for each distance, but at least it's predictable.

Matt

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#9)  Re: Long Range Laser Rangefinder Test

Postby lalacurf121 » Wed Mar 23, 2016 5:14 am

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