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effect of temperature on scopes

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/16/2005 at 17:21
cutnbuck View Drop Down
Optics GrassHopper
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What effect does extreme low temp have on rifle scopes? I am looking at purchasing a Kahles, Zeiss or swarvoski scope but i hunt it temperatures down to

 -35c. will this affect scope zero and function? The swarvoski site only rates thier scopes to -20c.

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/16/2005 at 18:05
noddah View Drop Down
Optics Apprentice
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I wouldn't worry about an extreme cold or hot environments with any of the scopes listed. The real problem comes with extreme differences in temp and speed of which a scope goes from one extreme to another.

 

(I do not recall who did the test.. so I speak from memory)

 

But having a scope in an extreme cold (Such as -40 below zero) and bringing it to another extreme (Such as 80 - 100 above zero) the extreme cold to hot enviroment can cause a scope to loose its seal. I would guess also the type of seals used and the tolerance and make of the tube and glass would also have some bearing on this topic; but who is going to test the $3,000 scopes for us?

 

So to make a long story short... don't worry about the extreme just speed of which it warms back up.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/16/2005 at 20:31
ranburr View Drop Down
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The reason you see a -20c in the spec is because of the glass.  Almost any spec that you see on any optics, LCDs, etc. will have -20c.  Don't ask me why, but that is the standard.  They will function well below -20c.

 

ranburr

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/22/2005 at 16:27
cutnbuck View Drop Down
Optics GrassHopper
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thanks guys.

I tried to contact zeiss, swarvoski and kahles with my question also. Only zeiss responded saying that if any scope could handle the cold weather thiers could. They said they test thier scopes to extreme temps.

It's unfortunate the other companies did'nt get back to me but maybe this tells me a little somthing  about customer service for the brands contacted.

 

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