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One time at the club site, I wanted to do a side-by-side between the views in my 15" and a 16" LB. I was getting excellent high power views of saturn in good seeing at around midnight, some 4 hrs after set up.. I wandered over to the LB for a peek and saturn was a boiling bubbling mess.
These scopes with their 2" thick mirrors housed in such a way theres no airflow around the mirror could really benefit from forced air cooling. I'd say its mandatory or it will never perform like it should.
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