Oops - Rob's email was to me, personally. Sorry to all. Rob described the Hartmann mask for me, "cardboard disc same size as OTA w/ 3 evenly spaced holes, placed over the front, focus till all 'holes' align." I think that I "get it" generally, but my questions posted earlier still apply. ----- Original Message ----- From: "Kim Hyatt" <kimharch@cut.net> To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Sent: Wednesday, June 29, 2005 5:00 PM Subject: Re: [Utah-astronomy] nothing serious |I was going to ask, "What is a Hartmann mask?" but then I saw Rob's post. | (Thanks Rob - great pics, too.) I still have a couple of questions: Does | hole size matter? Distance from center? Distance of mask from refractor | objective, or SCT corrector plate? | | Oh, and thanks for the help all. | | | ----- Original Message ----- | From: "Michael Carnes" <michaelcarnes@earthlink.net> | To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> | Sent: Wednesday, June 29, 2005 4:23 PM | Subject: Re: [Utah-astronomy] nothing serious | | || Kim, have you tried a Hartmann mask? || || -----Original Message----- || From: Kim Hyatt <kimharch@cut.net> || Sent: Jun 29, 2005 3:36 PM || To: Utah Astronomy <utah-astronomy@mailman.xmission.com> || Subject: [Utah-astronomy] nothing serious || || BlankHi all. Some of you know that I recently moved to Mt. Pleasant (and | many of you probably don't care). I have a home a few miles east of town, | with very DARK skies and great views of the valley and mountains. Our | elevation here is about 6400 feet and there's very little light pollution, | even from Mt. Pleasant itself, just three miles away. Hope some of you may | be interested in visiting sometime. || || I've been experimenting with my Nikon D70 and I've captured some | successful wide-angle images. Shortly I'll post them to the gallery. I have | also recently tried some prime-focus pics, but I have trouble getting the | focus correct. Anyone out there know some cool trick to focus accurately | with a digital SLR? Keep in mind that you can't remove the camera back for a | knife-edge focus. I also may try imaging with my 8-inch SCT, so tips would | be helpful. || || Hope to rendezvous with y'all sometime. How about a star party at the old | Skyline Drive site? Also, is Wolf Creek the pick for July's SLAS private | star party? || || || Kim A. Hyatt, Architect || P.O. Box 124 || Mt. Pleasant, Utah 84647 || T: 435.462.9207 || F: 435/462.5013 || M: 801.631.5228 || kimharch@cut.net || || || || || _______________________________________________ || 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.utahastronomy.com || || ______________________________________________________________________ || This e-mail has been scanned by Cut.Net Managed Email Content Service, | using Skeptic(tm) technology powered by MessageLabs. For more information on | Cut.Nets Content Service, visit http://www.cut.net || ______________________________________________________________________ || || | | | | _______________________________________________ | 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.utahastronomy.com | | ______________________________________________________________________ | This e-mail has been scanned by Cut.Net Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on Cut.Nets Content Service, visit http://www.cut.net | ______________________________________________________________________ | | ______________________________________________________________________ | This e-mail has been scanned by Cut.Net Managed Email Content Service, using Skeptic(tm) technology powered by MessageLabs. For more information on Cut.Nets Content Service, visit http://www.cut.net | ______________________________________________________________________ | |