http://tech.groups.yahoo.com/group/Discovery-Dob-Users/ Discovery Dob Users Group Wed, 04 Nov 2009 18:54:14 GMT Jean http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13773 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13773 Just put a "wanted" ad at Astromart looking for an 8" F/7. Obviously, a Discovery would be my first choice. If you know anyone willing to part with one, let me Mon, 26 Oct 2009 06:14:03 GMT johangw http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13772 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13772 Bill told (wrote) me many times about his operations and plans. However, there was no improvements in lead times, they were generated by the pyrex shortage. Mon, 26 Oct 2009 04:10:45 GMT Harold http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13771 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13771 ... Thanks, Mo (If I may...) It's true that delivery times have always been the bugaboo with Discovery, but they can never be faulted on Quality! When I Mon, 26 Oct 2009 02:19:22 GMT skiestogaze http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13770 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13770 Hal, Phil Harrington, in the last edition of "Star Ware" said that he couldn't recommend Discovery scopes, not because of their quality, but because of the Mon, 26 Oct 2009 02:14:32 GMT Harold http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13769 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13769 ... HEY MAUREEN: I know nothlng of which you're speaking. HAL Sun, 25 Oct 2009 20:17:53 GMT skiestogaze http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13768 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13768 Congratulations Hal! Thanks for the interesting report on Bill's operation. Hopefully, he'll be able to turn things around and get Phil Harrington to "take Sun, 25 Oct 2009 00:15:43 GMT Harold http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13767 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13767 HELLO! I visited Discovery's manufacturing facility today to see if the three 15" Split-Tube components Bill provided for me would fit in my compact Toyota Sat, 24 Oct 2009 14:07:28 GMT skiestogaze http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13766 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13766 Marc, Don is extremely knowledgeable and helpful. He also own a 12.5" Discovery truss scope. I haven't seen him post on here in a very long time but you could Sat, 24 Oct 2009 14:05:17 GMT john_f_arkansas http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13765 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13765 I used fender washers too, when I first got the scope (15" TD), but finally built a new upper cage assembly, shaving off two pounds and greatly increasing Sat, 24 Oct 2009 03:00:36 GMT Harold http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13764 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13764 ... Yes, Maureen...the fender washers allow you to place more tension on the spider vanes by allowing that tension to be distributed over the wider area Sat, 24 Oct 2009 02:28:47 GMT saegaema http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13763 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13763 Thanks to all who responded with suggestions for correcting collimation slop. I will give a few of the recommendations a try. I'd done a search some time ago Fri, 23 Oct 2009 22:05:12 GMT Jack Barnes http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13762 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13762 Hi Marc, One big problem I have had with my Discovery 17.5" truss DOB is the constant need for re-collimation several times during an observing night. The Fri, 23 Oct 2009 21:52:35 GMT skiestogaze http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13761 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13761 About 4-5 years ago Don Penske(?) (Starman1 on CN) suggested replacing the small washers under the screws that hold the spider with fender washers. I tried it Fri, 23 Oct 2009 15:52:18 GMT saegaema http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13760 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13760 It's disappointing to hear you, too, experienced collimation going out of whack and only found resolution by turning to a solid tube assembly. I was hoping Fri, 23 Oct 2009 15:42:02 GMT Harold http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13759 http://tech.groups.yahoo.com/group/Discovery-Dob-Users/message/13759 ... HEY MARC: I had the same problem with my 20" Obsession when I owned it back in 2000. It would slip collimation 2 or 3 times a night when I went from near