You know, Chuck, commercial is probably the best route for me -- when I can scrape together the dough. I'll check out OPT. Thanks, Joe ________________________________ From: Chuck Hards <chuck.hards@gmail.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Tuesday, November 8, 2011 9:53 AM Subject: Re: [Utah-astronomy] Dew/Frost prevention On 11/8/11, Hutchings, Mat (H USA) <mat.hutchings@siemens.com> wrote:
While dew zappers are good ideas, for our mostly dry Utah air, I feel that passive dew prevention is mostly enough. Then again, I don't own a SCT or other design that have large corrector plates at the front. Those are really prone to loosing heat fast and dewing up.
Sorry I mis-spoke, Mat, I was under the impression several folks in your group were actively working on dew zappers at your place. Joe owns a SCT, and yes, those and the refractor owners are the ones who need the active dew/frost prevention, especially the imagers. It's simply never been a problem for me, but then I've been almost exclusively a convential-tube Newtonian user for most of my life. That amounts to one heckuva long dewcap. Seems like no-one on the list wants to buy the commercial dew preventers. The prices aren't bad, and you can get elements sized for everything from eyepieces to finders to objectives up to 14", from what I've seen. _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php