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Thread: Astrophtography - SLR Dew problems.

  1. #1
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    Default Astrophtography - SLR Dew problems.



    Hi everyone.
    After a very hot spell the temperature has finally begun to drop and whilst out shooting the Milky Way last night I had my first experience of dew forming on the front of my lens.
    Shooting 30 second exposures means that after cleaning I can still get a clear shot before the dew reforms, but cleaning after every image is a real pain.
    I was shooting with a Nikon D7000 and 16-24mm zoom (set to 16mm).
    I know heaters and lens hoods are options for scopes and longer lenses but I am struggling to think what would work for a wide angle lens such as this that is basically unprotected.
    Any suggestions would be gratefully received.

  2. #2
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    Default Re: Astrophtography - SLR Dew problems.

    If you have access to electricity, a hair dryer works well. There are 12 volt hair dryers that will run off a battery, but they take a lot of juice, so you'll need a honkin' big battery.
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    Default Re: Astrophtography - SLR Dew problems.

    Try making a cone shaped dew shield from thin closed cell foam from dollar store of Michaels. The sheets I used are slightly bigger than a 8x11 piece of paper. It has worked great for my finder scope. You just have to find the right cone shape and length that will not interfere with your fov.
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    Default Re: Astrophtography - SLR Dew problems.

    Found this Dew Prevention
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    Default Re: Astrophtography - SLR Dew problems.

    As another newbie, just got to say that I hit my first dew point 2 nights ago at precisely 2 am. I was shocked how wet everything got. Instantly. Scope lens, star diagonal, eyepieces in their case on a table. Until then, I’d sort of presumed that only the front of the scope might get some condensation. Clearly, even a dew shield and a heater band is not going to rescue the night when the humidity is high and the DP is reached because everything else you have is also going to be drenched. Gave me a whole new appreciation for the issue.
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    Default Re: Astrophtography - SLR Dew problems.

    Where are you storing the camera & lens? If it comes out of an air-conditioned home... it’ll be a dew magnet in humid environments. If you put store it outside in a safe spot and let it the lens warm up to ambient temperature, it’ll be much less likely to attract dew.

    Normally you just need to keep it a few degrees above the dew point. Check the forecast to see how far the dew point is below the ambient temperature. If dewpoint is within about 5F / 3C then you may need some extra protection from dew.

    A dew hood is typically about twice as long as it’s diameter.
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    Default Re: Astrophtography - SLR Dew problems.

    Check out link at bottom. 16$ usb dew heater. I use it on my Rokinon 24mm lens for Milky Way and my 80mm refrac.

    I used it a few nights ago. For 4 hours in 90% humidity. Everything but the lens was literally dripping wet.

    Protage USB Dew heater
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