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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
Thread started 14 Aug 2010 (Saturday) 09:43
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Condensation on lens?

 
MCB
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Aug 14, 2010 09:43 |  #1

Hi!

I'm new to night photography and astrophotography in particular. So maybe there is an obvious solution to the whole condensation problem that I just don't know about. But I have found that on many nights I get condensation on my lens after an hour or so.

Do you guys just not go out and shoot if the temp is getting too close to the dew point? Is there a trick to keep this from happening?

Thanks.




  
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Adrena1in
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Aug 14, 2010 09:54 |  #2

Only way I know to stop this, (or remove the dew), is a burst from a hair-dryer, or a dew-heater, which is a strap that goes round the lens and is kept warm, thus keeping the dew away. (Only really use these myself on my telescope, but I have a small one for a lens if I ever need it.)


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MCB
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Aug 14, 2010 10:03 |  #3

Wow, cool. Thanks for the tip. Google gives lots of results for dew heaters. I had been thinking of the hair dryer option, but that's limited based on the availability of a plugin. The dew heaters look fairly cheap and portable. Thanks again!




  
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MCB
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Aug 14, 2010 10:35 |  #4

Maybe this is really dumb, but can you use a rubber band or something like that to strap a couple of those chemical hand warmers onto the lens? Are they too hot? I have used some that last for hours and are very cheap.
If they are too hot, would adding a little insulation between them and the lens do the job?

If that's not totally insane it would be something I would be able to use tonight.
thanks!




  
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mtbdudex
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Aug 14, 2010 10:54 as a reply to  @ MCB's post |  #5

ok , not for tonight but this seems easy enough to make as DIY project.

http://www.metacafe.co​m …7/diy_lens_warm​er_heater/ (external link)

I'd make mine use these rechargeable battery packs I have for my electric RC car already.

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Footbag
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Aug 14, 2010 11:11 |  #6

MCB wrote in post #10720113 (external link)
Maybe this is really dumb, but can you use a rubber band or something like that to strap a couple of those chemical hand warmers onto the lens? Are they too hot? I have used some that last for hours and are very cheap.
If they are too hot, would adding a little insulation between them and the lens do the job?

If that's not totally insane it would be something I would be able to use tonight.
thanks!

I tried this with my telescope. It didn't work.


Adam
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PhotosbyKev
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Aug 14, 2010 11:17 |  #7

MCB wrote in post #10720113 (external link)
Maybe this is really dumb, but can you use a rubber band or something like that to strap a couple of those chemical hand warmers onto the lens? Are they too hot? I have used some that last for hours and are very cheap.
If they are too hot, would adding a little insulation between them and the lens do the job?

If that's not totally insane it would be something I would be able to use tonight.
thanks!

Cut the toes off some woollen socks and then slip the sock over the lens and double it back to make a pocket.

Slip a handwarmer inside and it will warm up the air local to the lens and slow the onset of condensation forming on the lens.

Be aware there are two types of warmers. One is activated by contact with skin and needs the moisture to operate correctly, the other version is air activated which is the one you want.


regards

Kev Lewis.
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martyn_bannister
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Aug 14, 2010 12:28 |  #8

The other night all I had was a floor standing fan and played that onto the lens/camera. Seemed to help. Of course, I was in my back gfardenn, not miles from anywhere :)




  
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MCB
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Aug 14, 2010 13:30 |  #9

mtbdudex wrote in post #10720193 (external link)
ok , not for tonight but this seems easy enough to make as DIY project.

http://www.metacafe.co​m …7/diy_lens_warm​er_heater/ (external link)

I'd make mine use these rechargeable battery packs I have for my electric RC car already.
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Hey, that is neat. It looks very simple and cheap. Thanks!




  
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MCB
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Aug 14, 2010 13:30 |  #10

PhotosbyKev wrote in post #10720280 (external link)
Cut the toes off some woollen socks and then slip the sock over the lens and double it back to make a pocket.

Slip a handwarmer inside and it will warm up the air local to the lens and slow the onset of condensation forming on the lens.

Be aware there are two types of warmers. One is activated by contact with skin and needs the moisture to operate correctly, the other version is air activated which is the one you want.

Even easier! Even cheaper! I love it. :)
I will try this one tonight and see how it goes. Thanks for all the tips.




  
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Condensation on lens?
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