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    Default DIY binocular dew heater advice?



    Hey Folks,

    John from San Francisco here, first time poster and noob. Hello!!

    I'm really enjoying my first set-up, a pair of Pentax 10x50 pcf wpII's and a parks tripod, trying to navigate my way around despite the San Francisco Nebula and my noob understanding of star charts. Still, I'm impressed by what my setup does for my study!

    So, I realized I was getting heavy dew on my binos last night and wanted to figure out a diy dew heater hack. It doesn't often get below 40F here, so i don't need a ton of watts comparatively (my googling indicates 1.5 watts per objective).

    I've search for diy hacks but couldn't find a ready solution. I'm thinking of something very simple, like an old flashlight hooked up to a series of resistors that are linked by copper wire around each objective and velcro/taped in place.

    Complete screwball idea? Any advice is appreciated, thanks!!

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    Hi John welcome to the forums!
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    Default

    Welcome John!
    I have the same bins, but sorry, I don't have any fancy dew solutions for you. I just use a hair dryer on an extension cord when need be. Simple and effective. I think there may be a few ( hard to find?) battery operated hair dryers kicking around. I think they are harder to find because the low wattage makes them terrible for drying hair, but might just do the trick for your purpose. Your question I take it pertains more to preventing dew? Hopefully someone here has an idea for you. Cheers!

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    Hi john ..Welcome aboard the forums ...I have an older pair of pentax binoculars and the view from them is awesome ...

    I would try making a pair of small dew shields first , before i tried rigging a dew heater ...The shields could even be made out of cardboard to start off with ..You might also try using some of that real thin aluminum flashing for watreproofing corners of roofs ..You can get this stuff from home improvement stores like lowes and home depot ..Depending on how big the objectives are , you might even be able to use some old can's for soda or soup ..."Campbells" has that new soup called "soup at hand" in the cup that might be able to modify ..The can is some sort of styrofoam that is pretty tough , but might be easy to modify to fit over the lenses of your binoculars ..You could use some self stick foam strips on the inside of the cans to make them snug ..Just an idea ...Do the binoculars fog up as soon as you go outside , or do thew dew up twoard the end of your viewing session ? You might try these guys ScopeStuff They have 12volt hair dryers for 24 dollars with priority shipping included in the united states .Hope some of this help's ...And hope you have clear skys ...

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    I did find an aussie site goolging where the bro puts a bunch or resistors in series (I think?), duct tapes them in a strip, wraps them around an 80mm objective, and hooks it up to 12V.

    I put together something similar together, putting 4-15ohm resistors in series, made a strip out of it with duct tape, and will hook it up to 12V, put it on one objective, and stick the rig outside in a bit and see what happens. On a 9V test run, it was warm...

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    ScopeStuff

    I found this on the site that Rich linked.. seen this yet? Scroll to DN19.
    Last edited by GriffinBF; 08-06-2009 at 03:30 AM.

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    That is a great suggestion for the dew heater but the controller is 109. dollars and you have to add the heating elements ...The 12 volt hairdryer is only 24 dollars ...Although you could use the dew heater for a scope at a later date if you wanted to ...
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    So far I've got $1.08 into my rig and if my math is right it will make 2.4 watts, which *might* be enough heat to keep it above the dew point..?

 

 

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