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AXAF
sage
Reged: 09/15/04
Posts: 234
Loc: New England
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I observed last night in the cold (temps in the 30s) with friends and proudly brought along my new green laser pointer. However, when I went to shoot the beam up into the sky, I got barely any sort of output. I surmised that the cold was the cause of the problem, and tried to warm it up by keeping it in a jacket pocket, which seemed to help though not much. Does anyone have a better approach?
As soon as I brought it back home and gave it a chance to warm up, the beam shined brightly again.
-Gary
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Torus Optics 32cm f/6 Dob
Osypowski Equatorial Platform
Fujinon 10x70
Coronado PST plus SolarMax 40 filter
Vixen GPD2 on a Berlebach Tripod
StellarVue SV90T
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nyc_nurse
sage
Reged: 07/29/09
Posts: 253
Loc: nyc
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That's pretty much what happens with the output of lasers in the cold. Some models boast feed-back circuitry that reduces temp related output drops but best thing would be to keep it as close to your body as possible when not using it.
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Sam P.
www.agirlandaguy.blogspot.com
Pentax 7X50
TV-102 APO w/ (Starbeam - on backorder  )
Ash Gibraltar w/ SkyTour DSC
NZ3-6, N9T6, N13T6
TV 20 Plossl
Pan 24, 35
Pentax XW10, XW14
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scott m
super member
Reged: 12/06/07
Posts: 189
Loc: Hatfield Pa
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I keep mine next to a hand warmer in my pocket, it still gets cold rather quickly but keeps it warm enough to make it usable.
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Orion Astroview 120st EQ w/rigel+2"diag(Cosmo)
Zhumell 10 inch dob w/telrad (Oddball)
Nikon AE 10x50 Binos
Astro-Tech Paradigm 5,8,12,15,18,25mm
GSO SuperView 30mm,20mm,15mm,10mm
Knight Owl EWA 6mm,9mm
Zhumell Plossl EP Kit
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Tim A.
sage
Reged: 09/19/07
Posts: 236
Loc: 40 30'N 105 3'W
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I keep mine in my shirt pocket, next to my skin. Depending on the temperatures, whatever layers are above it seem to keep it warm enough to work at 100%.
By the way ... does permitting a GLP to get very cold (sub-zero F) harm it in any way? I was wondering if it's OK to leave it in my vehicle full-time, but it sometimes gets very cold here. I would never use it until I'd warmed it up to about 70 degrees (shirt-pocket temperature), but it would go through some temperature extremes in the "off" state. Does anyone know for sure if that's OK? I've been keeping it indoors.
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Starbuckets 12.5" Dob
Celestron CPC800
Celestron CR-150 HD on CG5-GT
Galileoscope
Oberwerk Deluxe II 20x80 & Ultra 10x50
Celestron Regal LX 8x42
Bio-binoculars 1x6
"Me? Crazy? Oh, yeah. Crazy like an ox!"
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Tony Flanders
Post Laureate
Reged: 05/18/06
Posts: 3457
Loc: Cambridge, MA, USA
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Quote:
I tried to warm it up by keeping it in a jacket pocket ...
Laser pointers are nice and slender. I keep mine in my pants pocket, where it stays *really* warm. Jacket pockets are for things that need warmth, but not so much, like eyepieces and eyeglasses.
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Tony Flanders
First and foremost observing love: naked eye.
Second, binoculars.
Last but not least, telescopes.
And I sometimes dabble with cameras.
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