Leica 1600 baro readings

[denny2]

I wanted to use the Baro reading from my 1600 to enter into a ballistics program. But it shows 14.14 ? I checked the local weather and it is 29.97. My rangefinder is set to US . Am I missing something?

 

[Alan Griffith]

Deny

Leica missed the boat on that one and put it in psia. Here is the ref chart I use. Your 14.14 should be about 500 ft. The new 1600-B corrected this but messed up by putting 1/4 moa "clicks" such as "C 64" instead of 16 MOA.

Alan

Air Pressure and Altitude above Sea Level

The table below indicates air pressure at elevations below and above sea level.

Altitude Above Sea Level Absolute Barometer Absolute Atmospheric Pressure
feet meters inches Hg mm Hg psia kg/cm2 kPa
-5000 -1524 35.7 908 17.5 1.23 121
-4500 -1372 35.1 892 17.2 1.21 119
-4000 -1219 34.5 876 16.9 1.19 117
-3500 -1067 33.9 861 16.6 1.17 115
-3000 -914 33.3 846 16.4 1.15 113
-2500 -762 32.7 831 16.1 1.13 111
-2000 -610 32.1 816 15.8 1.11 109
-1500 -457 31.6 802 15.5 1.09 107
-1000 -305 31.0 788 15.2 1.07 105
-500 -152 30.5 774 15.0 1.05 103
01) 0 29.9 760 14.7 1.03 101
500 152 29.4 746 14.4 1.01 99.5
1000 305 28.9 733 14.2 0.997 97.7
1500 457 28.3 720 13.9 0.979 96.0
2000 610 27.8 707 13.7 0.961 94.2
2500 762 27.3 694 13.4 0.943 92.5
3000 914 26.8 681 13.2 0.926 90.8
3500 1067 26.3 669 12.9 0.909 89.1
4000 1219 25.8 656 12.7 0.893 87.5
4500 1372 25.4 644 12.5 0.876 85.9
5000 1524 24.9 632 12.2 0.860 84.3
6000 1829 24.0 609 11.8 0.828 81.2
7000 2134 23.1 586 11.3 0.797 78.2
8000 2438 22.2 564 10.9 0.768 75.3
9000 2743 21.4 543 10.5 0.739 72.4
10000 3048 20.6 523 10.1 0.711 69.7
15000 4572 16.9 429 8.29 0.583 57.2
20000 6096 13.8 349 6.75 0.475 46.6
25000 7620 11.1 282 5.45 0.384 37.6
30000 9144 8.89 226 4.36 0.307 30.1
35000 10668 7.04 179 3.46 0.243 23.8
40000 12192 5.52 140 2.71 0.191 18.7
45000 13716 4.28 109 2.10 0.148 14.5
50000 15240 3.27 83 1.61 0.113 11.1

 

[denny2]

Thank you!!!
Why would they do that? Or is that a measurement they use in other countries?
Thanks for posting that chart.

 

[Alan Griffith]

Deny,

I think because Leica is German (?) they must think we use psia; what ever psia means.

All I could find was this

psia, (lb/in2) abs

The lb/in2, no problem. The abs, no idea. May not even be European.

Alan

 

[Alan Griffith]

Aaahh. a = absolute.

Pounds per square inch - Wikipedia, the free encyclopedia

 

[denny2]

Absolutely! Lol. Now another chart to carry with me. Thanks again!

 

[Alan Griffith]

Here is a chart I created.

Elev = Barometric = psia
4000' = 25.8 = 12.7
4500' = 25.4 = 12.5
5000' = 24.9 = 12.3
5500' = 24.5 = 12
6000' = 24 = 11.8
6500' = 23.6 = 11.6
7000' = 23.1 = 11.3
7500' = 22.7 = 11.1

 

[rooster721]

I've got a 1600crf.. thought I'd ask you guys that also have them whether or not the shown distance IS actually a corrected distance, considering angle?? Does anyone know or have tested that in the field by chance? Is quite important to know actually... especially given mountain situations for sheep & such

I was told it is.. but don't seem to see it in the manual (unless I completely missed) Anyways, don't mean to steal the thread at all... just figured I'd ask, is somewhat related..

Thanks

 

[yawn]

If I use the info from the 1600 I just double the psi reading to give close enough baro readings .Useing presure as asoloute i dont worry about altitude at all.

 

[Alan Griffith]

Oh my gosh! You're right!

Thanks,

Alan

 

[denny2]

That makes it simple, Thanks!
Rooster, Im not sure. Maybe someone else knows the answer to that one. I dont have too many mountains where I live.

 

[Pdvdh]

Atmospheric Pressure Conversion Factor from psia to inches of Hg is 2.036

psia x (2.036) = Inches Hg