Click here if you are having trouble logging into the forums Cloudy Nights - Official Forums of the 2009 International Year of Astronomy Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User   You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Eyepieces Previous   Index   Next   Flat   Brooklyn scholastic sledgehammer Reged: 07/24/08 Posts: 870 Loc: Central New Jersey Re: Trying to "modify" baader hyperions, help!       08/06/08 01:39 AM Edit   Reply   Quote   Quick Reply:   http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/1504610/page/0/view/collapsed/sb/5/o/all/fpart/1/vc/1 Here is an old thread from 2007 that i pulled up. I notice there are some bad drawbacks to actually using these extention rings... " When do you use your extension rings? Do you add/change them while observing, or do you adjust your EP's before hand based on what you want to observe? Just curious. Tom They _can_ be changed in the field. It's pretty much like putting a filter on. That said, it has to be a clean environment since cleaning the internal two lenses is going to be very hard. I have done it in the field to see how it works since I'm lens poor. It's also not very dirty/dusty where I observe. I own a 13mm and I plan to keep the either the 28mm or 14mm installed to give me a 11 or 9mm eyepiece. Not sure which yet. I have a 17mm and 13mm. The next time I'm out I'm going to add in a tuning ring to convert the 17mm down to 13mm and I will compare the two in the field. Do be warned the eyerelief seems to reduce when you add in the fine tuning rings. The 17mm with the 28+14mm seems to have about 10 maybe 12mm of eye relief. I think. " -post by boren. So this post stated that using these Fine tuning rings (14 and 28) cause the 20mm of eye relief to drop down to 10-12mm? how is this possible? How can decreasing the focal length have such an impact on eye relief? The eye relief issue is the only negative aspect of using the FTRs. Anyone have any experience or opinions on this? -------------------- Meade 8.25"(209.55mm) LX-90 EMC (SCT) Albert Einstein => “Intellectual growth should commence at birth and cease only at death.” “If you can't explain it simply, you don't understand it well enough.” Post Extras       Entire thread Subject Posted by Posted on Trying to "modify" baader hyperions, help! Brooklyn 08/06/08 01:23 AM Re: Trying to "modify" baader hyperions, help! BillP   08/06/08 06:29 PM Re: Trying to "modify" baader hyperions, help! Brooklyn   08/06/08 06:42 PM Re: Trying to "modify" baader hyperions, help! BillP   08/06/08 10:06 PM Re: Trying to "modify" baader hyperions, help! Brooklyn   08/06/08 11:10 PM Re: Trying to "modify" baader hyperions, help! BillP   08/06/08 11:32 PM Re: Trying to "modify" baader hyperions, help! Phillip Creed   08/07/08 09:10 AM Re: Trying to "modify" baader hyperions, help! Gaz O'C   08/08/08 12:33 PM Re: Trying to "modify" baader hyperions, help! Brooklyn   08/08/08 07:05 PM Re: Trying to "modify" baader hyperions, help! BillP   08/07/08 05:01 PM Re: Trying to "modify" baader hyperions, help! Brooklyn   08/07/08 06:39 PM Re: Trying to "modify" baader hyperions, help! BillP   08/07/08 09:37 PM Re: Trying to "modify" baader hyperions, help! Brooklyn   08/08/08 01:28 AM Re: Trying to "modify" baader hyperions, help! Lawrence Sayre   08/06/08 06:47 PM Re: Trying to "modify" baader hyperions, help! Brooklyn   08/06/08 07:08 PM Re: Trying to "modify" baader hyperions, help! Lawrence Sayre   08/06/08 07:26 PM Re: Trying to "modify" baader hyperions, help! NGC6144   08/06/08 06:59 PM Re: Trying to "modify" baader hyperions, help! Lawrence Sayre   08/06/08 07:21 PM Re: Trying to "modify" baader hyperions, help! Brooklyn   08/06/08 01:39 AM Re: Trying to "modify" baader hyperions, help! Wobrak   08/06/08 06:47 AM Re: Trying to "modify" baader hyperions, help! DSalters   08/06/08 01:41 PM Re: Trying to "modify" baader hyperions, help! Brooklyn   08/06/08 01:53 PM Re: Trying to "modify" baader hyperions, help! Lawrence Sayre   08/06/08 04:43 PM Re: Trying to "modify" baader hyperions, help! Brooklyn   08/06/08 05:42 PM Re: Trying to "modify" baader hyperions, help! Lawrence Sayre   08/06/08 05:48 PM Re: Trying to "modify" baader hyperions, help! Lawrence Sayre   08/06/08 01:40 PM Extra information 5 registered and 5 anonymous users are browsing this forum. 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