Thanks Klaus, just as I'd resigned myself to keeping my CF C11 as my primary tool for the long haul. Nothing like a concise, first-hand, highly positive review to give a guy second thoughts. Darrell Spencer (who has genuinely tried to turn a deaf ear toward words of temptation) -----Original Message----- From: az-observing-bounce@xxxxxxxxxxxxx [mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Klaus Brasch Sent: Tuesday, December 04, 2012 1:05 PM To: az-observing@xxxxxxxxxxxxx Subject: [AZ-Observing] Re: Celestron White Paper on their HD Technology - a Good Read Having owned and used a C-11 HD for three years now, I can attest that the white paper is honest and accurate in all aspects. For a more detailed review see pg 69 in the Jan-Feb 2012 issue of Astronomy Technology Today (www.astronomytechnologytoday.com). I have previously owned and imaged with several older Celestron SCTs, including a classic 10, and more modern C-11 and C-14. The HD version is significantly better in all respects, both visually and for imaging. Better contrast, very flat field, no coma. Visually it's more like an 11-inch apo refractor, totally color free, with pin point stars across the fov. For imaging there is no comparison. A focal reducer, either from Celestron (0.7 X) or Optec Lepus 0.62 x) is essential for imaging wider fields, etc. The passive vents and mirror locks also work very well, although mirror flop is not totally eliminated. All in all a fine instrument. Klaus -----Original Message----- >From: "David M. Douglass" <dmdouglass@xxxxxxxxxxxxxxx> >Sent: Dec 3, 2012 5:43 PM >To: az-observing@xxxxxxxxxxxxx >Subject: [AZ-Observing] Celestron White Paper on their HD Technology - a Good >Read > >Well, I can't forward the actual email from Celestron, but I can post the >link to their White Paper... > >http://www.celestron.com/portal/technologies/edgehd-optics/&utm_source=Celes >tronblast&utm_medium=Email&utm_campaign=EdgeHD/ > >Not an endorsement. I don't own one, and probably won't (in the near >future)... >But I am curious about their technology, and I like to learn. >I found it a "good read".... > >David M. Douglass >dmdouglass@xxxxxxxxxxxxxxx (secondary) >david@xxxxxxxxxxxxxxx (main) >Cell (602) 908-9092 > > >-- >See message header for info on list archives or unsubscribing, and please >send personal replies to the author, not the list. > -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list. This communication, including any attachments, may contain information that is proprietary, privileged, confidential or legally exempt from disclosure. If you are not a named addressee, you are hereby notified that you are not authorized to read, print, retain a copy of or disseminate any portion of this communication without the consent of the sender and that doing so may be unlawful. If you have received this communication in error, please immediately notify the sender via return e-mail and delete it from your system. -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.