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Thats the normal method John, its the setup of fan placement or a baffle I was wondering about. I dont know if these tubes could handle having a fan placed above the top of mirror.
An hour is a reasonable amount of time to cool John's scope with the fan on John.
Try one , youll like it. Great for those 'gee,the clouds have gone,get the scope out' moments. Cool down times are quicker on our fan forced gs than the fanless Parks pyrex, both 12",give or take half an inch.
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