Rangefinder

chrisgas

Member
Traipsing across woodland in straight lines with a half full bottle of whisky can be difficult.
Time to visit the hiking section Geoff, buy one of those bottles that fits in your jacket pocket and has a feeder tube. 😉 it leaves your hands free to hang on to a tree or two.
 

geoffretired

Supporter
Supporter
That conjures up a wonderful image for the younger members of the forum.
For the elderlies, like me, the bottle would be down at about ankle height, and the feeder tube would allow the bottle to be filled discretely.
 

dvd8n

Supporter
Supporter
Having sung the praises of my Hawke, I couldn't get a reading from it at all today. And it was only -3°C!
 

Shirt

Well-known member
Having sung the praises of my Hawke, I couldn't get a reading from it at all today. And it was only -3°C!
The 'Archers Choice' :D :D :D Nikon I've got also tends to give a reading of 4.4m on everything once the temperature gets below zero. No idea why.
 

malbro

Instinctive Archer
Supporter
Nikon I've got also tends to give a reading of 4.4m on everything once the temperature gets below zero. No idea why.
Well commercial electronic components are only rated 0 to 70C so its not surprising they do not work correctly at the outer limits of their specifications, even the batteries are likely to be having problems providing the power at those temperatures.
 

dvd8n

Supporter
Supporter
Well commercial electronic components are only rated 0 to 70C so its not surprising they do not work correctly at the outer limits of their specifications, even the batteries are likely to be having problems providing the power at those temperatures.
Well Hawke do claim -10°C, but I do agree that that's probably optimistic, especially as far as the battery is concerned - it's not new so was probably marginal.
 

malbro

Instinctive Archer
Supporter
Ahem, my cheapie worked in -1 yesterday with no issues.
Electronic components are specified as 0-70C for commercial, -40 to 85C for industrial and -55 to 125C for military, that doesnt mean they stop working outside those ranges, just they are not expected to work. Also most electronic manufacturers make components using the same process for all classifications and then classify them during the test procedure, for commercial reasons once they have the right number for a particular specification they will downgrade components to fill other classifications. So you may well get an commercial component that is really capable of better operation, just down to luck!!.
The battery is the main source of the problem for low temperature operation as it is a chemical reaction and that is temperature dependant, also the length of time at a particular temperature. For example if you keep the device in a pocket and only occasionally get it out to use it has a better chance staying above the ambient temperature, than one left dangling on a cord around your neck or wrist with no other protection.
 
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