Certainly no need to be embarrassed
, and you're right, Bird is certainly the man to talk too. We have discussed the topic, but have been unsure if my primary would need additional cooling as it's a lot smaller than his and might not suffer the substantial delay in natural cooling that his does.
Originally I was going to attach temp sensors over my scope to determine if I needed cooling so in that regard the simulation program has certainly made that task a lot easier.
From your experience Bird, what temperature difference between the primary mirror and ambient has been enough to noticeably affect image quality and warrant cooling?