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I was restraining myself on this one. While the article is informative , as someone who has built a few scopes myself , who has also researched this subject, it doesn't discuss the very good reasons that high end scope makers like Planewave still supply fans on their scopes - and it's not just because of market expectation.
The article does talk about the benefit of air flow across the mirror but doesn't point out the obvious, that simply tuning the rear fan around makes it into a puller instead of a pusher; that coupled with the standard fan shroud mod to enclose the back and create ducted flow, and the use of tube baffle just above the mirror, will draw air down across the mirror face and around it to exit out the rear.
Planewave CDKs use rear air extraction. The use of rear extractors can negate the need for mirror surface blowers, especially if a 'cuff' is used around the mirror to aid duct effect. In Planewave's case the fans are, I believe, computer controlled, but to what intent other than perhaps throttling the PWM I am not sure.
This maybe beyond the intent of the article in fairness, and it is impossible in a short article to cover all possble designs.
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