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Thread: Dew Sheild or/and heater?

  1. #1
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    Default Dew Sheild or/and heater?



    I previously had a reflector scope so dew didn't seem to be a problem, but I have recently bought a 5 inch sct.
    Last night after about 2 hours the temp dropped below freezing and I was wondering why I was having difficulty seeing. A quick look at the front showed a good layer of dew. Time to pack up and go home.
    So the question I have is: Do I get a dew sheild only, or is it worth the extra for one with a heater built in, bearing in mind I also then seem to need a controller and possibly a double cigarette power adaptor?
    Any tips appreciated.

    PS
    I live in southern Scotland... so dew is going to be a regular issue I think.
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    Default Re: Dew Sheild or/and heater?

    Definitely get or make a dew shield. I take an 8" SCT to star parties, as it is more portable than my Newt, and I use a dew shield made from a 1/2" thick closed-cell foam camp mattress and some duct tape. It works well enough that I haven't found the need for a heater. By the time the dew shield starts to fail, it is cold enough and wet enough to pack it in for the night anyway.

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    Default Re: Dew Sheild or/and heater?

    A dew shield is a MUST HAVE for the SCT. You can easily make one yourself. But it would be worth it to me to get one with a built in dew heater. However, I do not have one. I do have heater strips that I can use. But before I got the strips, I would use my dew shield and my 12v travel hair dryer as needed and that would keep me viewing as long as I wanted.

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    Default Re: Dew Sheild or/and heater?

    With humidity often in the 80-90% range, I use extra long dew shields made from 5mm EVA foam. For example, the shield on my SN8 is over 20in in length. With that shield, the only time that dew magnet has fogged was 4-5 hours in on nights with +90% humidity.
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    Default Re: Dew Sheild or/and heater?

    I have the hair dryer. It really works for a good hour or two. I then just heat up the lenses again. I do not like a lot of electronic stuff/gadgets. However, I was once interested in the zap on. All you need is one 9v battery. Not a whole lot of wires getting in the way.

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    Default Re: Dew Sheild or/and heater?

    Thanks all for the replies everyone.
    Having asked here and in a local fb group I have bought the astrozap sheild with the built in heater.
    I could also be tempted by one of those hair driers for those times when I also fog up the eyepiece.
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    Default Re: Dew Sheild or/and heater?

    Quote Originally Posted by WolfDancer View Post
    Thanks all for the replies everyone.
    Having asked here and in a local fb group I have bought the astrozap sheild with the built in heater.
    I could also be tempted by one of those hair driers for those times when I also fog up the eyepiece.
    The hair dryer works good for EPs, but it's also a good idea to keep one or two capped EPs in your pocket. When one fogs up, switch it out with one in your pocket.
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    Default Re: Dew Sheild or/and heater?

    That could answer a question I had about purchasing EPs.
    I have been looking to add at least one more to the 25mm and 10mm I already have, but wanted a wider apov for deep sky veiwing. Celestron 32mm plossl and ES 26mm 62° seem to offer very similar views... just more magnified with the 26...... so may opt for the 26 to swap with the 25 when fogged.
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