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MSammon

Dew on eyepieces p

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I sometimes find towards the end of my sessions dew building up on the eyepiece and giving like a tunnel vision. What do you use to dry them?

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Minor dewing can be removed with a 12v dew gun, or even fanning with a hand may work. Next step can be wrapping the eyepiece with a heated dew band, a smaller version of that used for a refractor objective.

Eyepieces not in use are best not kept in the open, like those eyepiece racks fixed to scope mounts.  I keep eyepieces in an inside pocket, being a touch warmer they don’t dew up as quickly when placed in the focuser.  A gently heated eyepiece case may be good.

At the end of a session all kit should be allowed to thoroughly dry before being put into storage.

Ed.

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I keep my eyepieces a little warmer than the outside temperature which seems, mostly, to stop them dewing. If they get too cold they will mist up from the warmth of your eye as it gets close to the eye lens, which is frustrating.

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40 minutes ago, NGC 1502 said:

 

Minor dewing can be removed with a 12v dew gun, or even fanning with a hand may work. Next step can be wrapping the eyepiece with a heated dew band, a smaller version of that used for a refractor objective.

Eyepieces not in use are best not kept in the open, like those eyepiece racks fixed to scope mounts.  I keep eyepieces in an inside pocket, being a touch warmer they don’t dew up as quickly when placed in the focuser.  A gently heated eyepiece case may be good.

At the end of a session all kit should be allowed to thoroughly dry before being put into storage.

Ed.

Have you got a link to a dew gun please?

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11 hours ago, MSammon said:

Have you got a link to a dew gun please?

There is one on “365 astronomy” website.   There may be cheaper options but this is better than those.

Ed.

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