jasonp Posted January 18, 2011 Share Posted January 18, 2011 I know this is really common and currently I have no shields etc.. but please could anyone give me some cheap tips to control dew.. My eyepieces mist up ( prob due to my heat ) secondary mirror etc.What do you all do ? Cheers J Link to comment Share on other sites More sharing options...
carastro Posted January 18, 2011 Share Posted January 18, 2011 Some people use a hairdryer. Carole Link to comment Share on other sites More sharing options...
nightfisher Posted January 18, 2011 Share Posted January 18, 2011 you can get a 12v hair drier to use with power tank Link to comment Share on other sites More sharing options...
rowan46 Posted January 18, 2011 Share Posted January 18, 2011 make a dew shield out of camping mat its cheap and easy if you need to get out tonight use some card stiff enough to hold the shape of a cylinderwrap some polythene round it and tape that round the end of the scope, it should project about 1.5x the apparture diameter Link to comment Share on other sites More sharing options...
kev i Posted January 18, 2011 Share Posted January 18, 2011 me to the sky has gone all milkey and there is some nice rings around the moon love it when it does .or is it a halo ? Link to comment Share on other sites More sharing options...
naked"I" Posted January 18, 2011 Share Posted January 18, 2011 make a dew shield out of camping mat its cheap Im off to the shop I work in to borrow some camping mats before the holiday season starts again, hope my boss (who is a nice guy) hasn't joined SGL Link to comment Share on other sites More sharing options...
John Posted January 18, 2011 Share Posted January 18, 2011 I keep my eyepieces a bit warmer than the outside air, in their case. Seems to stop misting unless you accidentally breathe on one.A dew shield should stop your secondary dewing - it is very close to the top of the tube with the Skywatchers. Link to comment Share on other sites More sharing options...
Glider Posted January 18, 2011 Share Posted January 18, 2011 The camping mat dew shield will help. I find mine extends viewing time by an hour or so but eventually the cold gets in. Then a 12V hair drier is fine but at 02:00 can annoy the neighbours. The real solution for me in the end was dew tapes and a controller. Obviously, at each of these stages the cost grows!! Link to comment Share on other sites More sharing options...
naked"I" Posted January 18, 2011 Share Posted January 18, 2011 A dew shield should stop your secondary dewing - it is very close to the top of the tube with the Skywatchers.Will I/we have to wrap the whole tube with a portion extending or just the top and some projecting?Sorry to jump in on your thread Jason.Dave Link to comment Share on other sites More sharing options...
rowan46 Posted January 18, 2011 Share Posted January 18, 2011 Will I/we have to wrap the whole tube with a portion extending or just the top and some projecting?Sorry to jump in on your thread Jason.Davejust the top with the shield extending about 1.5x the diameter of your tube Link to comment Share on other sites More sharing options...
russ Posted January 19, 2011 Share Posted January 19, 2011 I have a hairdryer on hand just in case. But i find the dew shield on the front of the 200P kept the dew off the secondary.While i keep the eyepieces i intend to use in my hand warming up. This keeps them dew free. I also load up my pockets with eyepieces (with caps on). Link to comment Share on other sites More sharing options...
jasonp Posted January 19, 2011 Author Share Posted January 19, 2011 Thanks all. So eyepieces best to keep warm then? Link to comment Share on other sites More sharing options...
vulcan Posted January 19, 2011 Share Posted January 19, 2011 As Jahmanson mentioned, breathing on a cold eyepiece is so easy to do and is an instant killer. I've had this problem several times and simply changing the eyepiece solved the problem. Link to comment Share on other sites More sharing options...
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