Ok, following the customary gentle and subtle way of IIS members (like a sledge hammer!
), I have revised the article and made a new submission to the Iceman to exchange the article for the new one.
I am actually very grateful for those who did take the time to post in this thread to bring to my attention my unintended bias towards the visual aspects of optics cooling. Yes, I was aware of the methods of cooling mentioned by Greg, Glen and Ray. But as I have not dealt with closed tube instruments for so long, the best practice methods for these instruments and for photo applications did slip my mind. I apologize for this. I am not so arrogant to not acknowledge this.
While Mike looks into the change of the article versions, you can find the revised article in my blog:
http://alexanderastrosketching.blogs...-and-bobs.html
Corrr, visual upsetting photo?
What's the world coming to...
Cheers
Alex.