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Joined: Aug 2005
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I use Lith-Ion batteries, and the LRF gets new ones before every mule deer season whether it needs it or not. I realize the laser doesn't care about light, but it does care about reading the reflectivity of the target. On days of poor reflectivity , conditions as stated in my OP, many LRF's struggle, like mine.


It is irrelevant what you think. What matters is the TRUTH.
GB1

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Originally Posted by Oldelkhunter
I think it is atmospheric conditions more then anything.


Atmospheric conditions matter, as do lighting conditions. Those are easy to observe and understand.

Variability among different samples, seems to baffle some.

Last edited by 4th_point; 12/09/18.
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Originally Posted by prm
Stick a hand warmer by the battery. PIA, but it helps those batteries that suck in the cold.



I do this same thing - in an exterior, accessible pocket. Cold weather really puts the wood to the Leica and Sig I've owned.
I can get it nearer my body beneath layers (for warmth) but that's a real PIA to use in a hurry when bundled up.


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Greg,

A few years ago I spent 11 days in Alaska waiting for a pair of Swaro binocs to dry out...………….never again

Lefty

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J
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SWAG it like they did in the old days.


Moe

"Pick out two!"
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Originally Posted by justsaymoe
SWAG it like they did in the old days.



Soooo easy when you know how....

https://www.24hourcampfire.com/ubbt...5-creedmoor-with-contraints#Post13298283

David

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Originally Posted by Crow hunter
I suspect it's the moisture in the air that's as much a problem as the temperature. We see in the 400-700 nanometer range of visible light. Laser rangefinders operate in a higher frequency range but I can't find the exact numbers except one place mentioned a bushnell rangefinder using a 905 nm. I suspect most companies keep it proprietary. Water absorbs in the 1400 nm range so if their lasers are in that range then water could interfere with it. There's also refraction from the water vapor like your headlights on a foggy night, that's what the LRF is seeing with a lot of water vapor in the air just in a different spectrum.

In the end I suspect picking the LRF rated for the most distance is going to give you the best chance of it working in less than ideal circumstances.



Most commercially available LRFs use 905nm lasers which is a longer wavelength, but lower frequency, than the visible light. In general, longer wavelength is beneficial for seeing through particulates in the air, like water droplets.

Of the consumer LRFs I have played with over the last few years, I think Sig Kilo 2400 is the best of the single lens units. With binoculars, Leica HD-B is the best I have seen yet.

Honorable mention goes to the image stabilized Nikon since it is easier to keep on target.

ILya

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