JOC Posted January 15, 2017 Share Posted January 15, 2017 I wear spectacles and goggles for skiing. I've also tried diving and worn a diving mask. All these are prone to fogging up with water vapour. As you may have read in my other thread I had a real problem with dew last night. Do astronomers use any anti-fogging treatments on their eyepiece lenses as well as the heaters? For example, in diving they 'spit' into the mask rub it around and crudely wash out any excess - it does a surprisingly good job. In skiing and optical glass you can buy various spray on treatments for the lenses. The best I've used in this area is a small smidgen of washing up liquid rubbed over and it will literally polish to a shine and work all day. Basically for large lenses anything capable of breaking down the surface tension on the water droplets seems effective in preventing misting up. I know the area of glass on an eyepiece is not huge, but do astronomers use any similar treatments, what and do they work? Link to comment Share on other sites More sharing options...
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