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Equipment Discussions >> ATM, Optics and DIY Forum

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mikey cee
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Reged: 01/18/07

Loc: bellevue ne.
New Refractor OTA's! WOW!! new
      #5615985 - 01/10/13 06:13 PM

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

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John Jarosz
Astro Gearhead
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Reged: 04/25/04

Loc: Fairfax, Iowa
Re: New Refractor OTA's! WOW!! new [Re: mikey cee]
      #5616039 - 01/10/13 06:44 PM

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


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mikey cee
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Reged: 01/18/07

Loc: bellevue ne.
Re: New Refractor OTA's! WOW!! new [Re: John Jarosz]
      #5616058 - 01/10/13 06:54 PM

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

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pstarr
Carpal Tunnel
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Reged: 09/17/04

Loc: NE Ohio
Re: New Refractor OTA's! WOW!! new [Re: mikey cee]
      #5616059 - 01/10/13 06:54 PM

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.

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Ed D
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Reged: 04/30/10

Loc: Sunny South Florida
Re: New Refractor OTA's! WOW!! new [Re: pstarr]
      #5616152 - 01/10/13 07:46 PM

Can't really say much.

Ed D

Edited by Ed D (01/10/13 07:47 PM)


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MKV
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Reged: 01/20/11

Re: New Refractor OTA's! WOW!! new [Re: mikey cee]
      #5616160 - 01/10/13 07:49 PM

Great, but don't you think this should be on the refractors forum rather than the DIY forum?

Regards,
Mladen


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Dave O
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Reged: 12/21/11

Loc: Sri Lanka
Re: New Refractor OTA's! WOW!! new [Re: MKV]
      #5616357 - 01/10/13 09:58 PM

Seems like a pretty big step backwards ... a sealed tube has generally been considered an advantage of refractors ....

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David PavlichAdministrator
Transmographied
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Reged: 05/18/05

Loc: Mandeville, LA USA
Re: New Refractor OTA's! WOW!! [Re: Dave O]
      #5616401 - 01/10/13 10:25 PM

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


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