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Thread: Eyepiece Help

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    KingWookie's Avatar
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    Default Eyepiece Help



    Most every time I use my telescope my eyepieces begin to fog up. I end up having to wipe the fog/dew away with my finger. Im afraid however touching my eyepieces may damage them. How should I deal with this.

    Also i think they are dirty from me touching them, how can I go about cleaning my eyepieces?
    Ryan
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    Yup, you can rub the coating off.

    If you are close to ac power, you can hit it gently with a hair dryer. Well, with the blast of warm air form the hair dryer.

    If you don't have ac power, you need a 12 volt hair drier.
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    Default

    I've used Lenspen optical cleaning solutions of various kinds on optics ranging from cameras, telescope components, weapons systems optics, and industrial/research optical component for years.

    They're cheap, effective, and if used properly don't damage optical coatings, finishes, or plastics.

    The also supply an effective anti-fogging solution that can be applied to components, it works reasonably well.

    Here is a link. They can be found on a variety of on-line sources:

    Lens Cleaner - LENSPEN is The superior lens cleaner system for all fine optics - camera lens - rifle scopes - camcorder and camera viewer screens - binoculars - scope

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    Default

    Hi Ryan ......Usually fog happens because you breath on your eyepieces ..Hot breath on cold glass dosent mix ...I try and direct my breath away from the glass on my optics ..Sometimes that is unavoidable and they fog up ..If this happens i swap out the fogged up glass for one that isent and go back to it once it clears up ...Of course , a 12 volt hair dryer also works as well as anti fogging wipes ....Karl Zeiss makes real nice wipes ..
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    Default

    When your eyepieces are very close to ambient temperature and the ambient temperature equates to the dewpoint, you can expect to get some fogging in a short bit. Holding your eyepieces with your bare hands for part of the time will help to stave off the development of moisture, but it won't do much good to look into the eyepiece with the shaking you will impart to the optical system while you warm the eyepiece.

    I don't know if a person could wrap an eyepiece with heat tape. Theoretically, with the right placement and control, you could greatly improve your fogging up problem.

    I also agree that, often as not, it is your own nasal or oral respiration that carries moisture-laden warm air that rises around your face. I did a lot of viewing out on the prairies in the dead of winter in Manitoba in the early 90's, and I learned two things. Pocket warmers, the smelly charcoal kind you get at camping supplies stores, but not in your pocket...in the far reaches of nice large pile-lined leather mittens, and also I learned to hold my breath while I got my view. If I had to breath, I pursed my lips to one side and directed my exhalation forcefully to the side, and then forced myself to breath slowly inward to prolong my time at the eyepiece.

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