· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums 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 >> ATM, Optics and DIY Forum Previous   Index   Next   Threaded   Pages: 1 mikey cee Postmaster Reged: 01/18/07 Loc: bellevue ne. New Refractor OTA's! WOW!!       #5615985 - 01/10/13 06:13 PM Edit   Reply   Quote Quick Reply   Take a look at this puppy. http://www.istar-optical.com/ Now that's what I call ingenuity. Not for me tho' I'm just too old school. But to many newbies and nonconformists this should be a grand slam! Mike Post Extras:       John Jarosz Astro Gearhead Reged: 04/25/04 Loc: Chicago area, IL Re: New Refractor OTA's! WOW!! [Re: mikey cee]       #5616039 - 01/10/13 06:44 PM Edit   Reply   Quote Quick Reply   Well, the only think I can think the refractor purists will complain about is the open tube will permit air current to distort the image (Horrors!). But the design does show some original thinking. I'm all for it. John Post Extras:       mikey cee Postmaster Reged: 01/18/07 Loc: bellevue ne. Re: New Refractor OTA's! WOW!! [Re: John Jarosz]       #5616058 - 01/10/13 06:54 PM Edit   Reply   Quote Quick Reply   I wondered about that too John. But Istar eays it plans to market a "sleeve" similar to what dobs use. Some may not see the need tho'. Would depend largely on their immediate surrounds I would guess. They also saw the findings by use of a "rail" scope in testing lenses. If rail scopes don't suffer much from thermals I guess they know what they are doing. I'm no expert. Mike Post Extras:       pstarr Carpal Tunnel Reged: 09/17/04 Loc: NE Ohio Re: New Refractor OTA's! WOW!! [Re: mikey cee]       #5616059 - 01/10/13 06:54 PM Edit   Reply   Quote Quick Reply   One of the strong points of the refactor is the fact that it has a closed tube. It keeps the optics clean, tube currents down and stray light out. I wouldn't want the design shown in the example. I really can't see any advantage to that design. Post Extras:       Ed D Carpal Tunnel Reged: 04/30/10 Loc: Sunny South Florida Re: New Refractor OTA's! WOW!! [Re: pstarr]       #5616152 - 01/10/13 07:46 PM Edit   Reply   Quote Quick Reply   Can't really say much. Ed D Edited by Ed D (01/10/13 07:47 PM) Post Extras:       MKV Carpal Tunnel Reged: 01/20/11 Re: New Refractor OTA's! WOW!! [Re: mikey cee]       #5616160 - 01/10/13 07:49 PM Edit   Reply   Quote Quick Reply   Great, but don't you think this should be on the refractors forum rather than the DIY forum? Regards, Mladen Post Extras:       Dave O sage Reged: 12/21/11 Loc: Sri Lanka Re: New Refractor OTA's! WOW!! [Re: MKV]       #5616357 - 01/10/13 09:58 PM Edit   Reply   Quote Quick Reply   Seems like a pretty big step backwards ... a sealed tube has generally been considered an advantage of refractors .... Post Extras:       David Pavlich Transmographied Reged: 05/18/05 Loc: Mandeville, LA USA Re: New Refractor OTA's! WOW!! [Re: Dave O]       #5616401 - 01/10/13 10:25 PM Edit   Reply   Quote Quick Reply   Link to Refractors. There's another thread just like this one in Refractors that's getting a lot more responses. I'm going to lock this one. David Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 8 registered and 26 anonymous users are browsing this forum. 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