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refractors & internal condensation/dewing

philipok

By philipok
in Getting Started With Imaging

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philipok

philipok

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hi all

I've been taking shots of M45 recently and I've noticed condensation in the inside of my W/O Zenithstar 61, leading to haloes on the brighter stars.  the front lens is fine and kept clear with a hairdryer.

I have been using a scope coat and I wondered whether that is trapping moisture - i.e the thermal shock of removing it might lead to condensation?

After reading other advice I have put the scope in a box with the eyepiece out and dessicant to dry out any residual moisture.

I don't currently have a dew heater (on order)..

Do members have any other suggestions for dealing with internal refractor condensation?

Philipok

 

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