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Excellent tip!

Probably work for telescopes too! Cheers

Very handy for camera lenses.
As far as telescope (reflectors) are concerned, I'm afraid this wouldn't work.

It works with camera lenses (though likely not with very big long focal schmidt/cassegrain tele lenses) because the lens is a relatively small encased space.
Telescopes represent a much bigger internal volume in comparison, resulting in convection turbulence. This added to a relatively long focal length (usually more than 1000 mm) is giving far too much image distorsion.

Common practice is to let the mirror cool down and adjust to external temperature before starting any observation.

cool

i'm sorry, but i dont understand what is it for? i'm complete ignorant about this subject... if you coud explain it to me...

When taking photos at night your lens can cool to a temperature below the air's dew point. This causes the water vapor in the air to condense on the front of your lens (this is how dew works). This dew will distort your photos.

This device will slightly warm your lens to keep this from happening.

Helló Kedves

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