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mikey cee
Postmaster
*****

Reged: 01/18/07

Loc: bellevue ne.
Red Hot New Concept OTA's
      #5616003 - 01/10/13 06:23 PM

Take a gander over here http://www.istar-optical.com/ Now that's what I call thinking out of the box! No wonder I got such a great lens from these folks. Remember a good quality product is no accident. Thanks guys! Mike

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Jerry Hyman
sage


Reged: 03/29/07

Loc: Mesa, Arizona
Re: Red Hot New Concept OTA's new [Re: mikey cee]
      #5616052 - 01/10/13 06:53 PM

WOW!

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ppfilbert
super member


Reged: 02/03/11

Re: Red Hot New Concept OTA's new [Re: Jerry Hyman]
      #5616063 - 01/10/13 06:56 PM

hmmmmm. very cool, but i know for a fact im gonna FLIP out when im looking down my scope and see a 6000 mile long mosquito sitting on the Moon!!!

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Dragonwatcher
Carpal Tunnel
*****

Reged: 01/21/08

Loc: Coupeville, WA
Re: Red Hot New Concept OTA's new [Re: ppfilbert]
      #5616140 - 01/10/13 07:42 PM

Hmmmm.... Any postings on timeline & pricing? Would these be apo or achro I wonder? Very intriguing.

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zjc26138
Loved By All
*****

Reged: 02/24/05

Loc: Mingo Junction, Ohio
Re: Red Hot New Concept OTA's new [Re: Dragonwatcher]
      #5616154 - 01/10/13 07:46 PM

Looks pretty cool. I'm interested and look forward to further developments and pricing.

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Jon Isaacs
Postmaster
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Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Red Hot New Concept OTA's new [Re: Dragonwatcher]
      #5616169 - 01/10/13 07:54 PM

Quote:

Hmmmm.... Any postings on timeline & pricing? Would these be apo or achro I wonder? Very intriguing.




The lens says it's an achromat.

As an owner of both Truss Dobs as well as tube Newtonians, it is worth mentioning that in the Newtonian world, there is concern with open scopes that the observers body heat warms the air and causes issues if it passes through the optical path... Tube scopes are desirable for planetary observation...

Jon


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Scott in NC
Mad Hatter
*****

Reged: 03/05/05

Loc: NC
Re: Red Hot New Concept OTA's new [Re: Jon Isaacs]
      #5616180 - 01/10/13 08:01 PM

Looks like it needs a light shroud.

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bluestar
Carpal Tunnel


Reged: 11/06/05

Loc: Maryland Eastern Shore
Re: Red Hot New Concept OTA's new [Re: Scott in NC]
      #5616193 - 01/10/13 08:10 PM

How many baffles come with this?

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Dragonwatcher
Carpal Tunnel
*****

Reged: 01/21/08

Loc: Coupeville, WA
Re: Red Hot New Concept OTA's new [Re: Dragonwatcher]
      #5616220 - 01/10/13 08:31 PM

Never mind - the pricing of this achro is on the web site. Found it.

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Istytray
journeyman


Reged: 01/01/13

Loc: Where the snow falls
Re: Red Hot New Concept OTA's new [Re: Scott in NC]
      #5616223 - 01/10/13 08:32 PM

Fascinating! Wonder if it'll actually be a "GAME CHANGER"....

Quote:

Looks like it needs a light shroud.




The description says they are developing one. They also seem to downplay its importance.


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Scott in NC
Mad Hatter
*****

Reged: 03/05/05

Loc: NC
Re: Red Hot New Concept OTA's new [Re: Scott in NC]
      #5616229 - 01/10/13 08:40 PM

Quote:

Looks like it needs a light shroud.




Never mind. I read the accompanying text, and it looks like IStar *will* be producing a light shroud for this. It's really quite an interesting concept--not at all necessary for small refractors, but it may increase the marketability of 6" and larger refractors, making scopes of this size much more practical from a mounting standpoint. I surely hope IStar succeeds with this new project!


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t.r.
Post Laureate
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Reged: 02/14/08

Loc: Upstate NY
Re: Red Hot New Concept OTA's new [Re: Istytray]
      #5616236 - 01/10/13 08:41 PM



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Jon Isaacs
Postmaster
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Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Red Hot New Concept OTA's new [Re: Scott in NC]
      #5616271 - 01/10/13 09:07 PM

Quote:

Quote:

Looks like it needs a light shroud.




Never mind. I read the accompanying text, and it looks like IStar *will* be producing a light shroud for this. It's really quite an interesting concept--not at all necessary for small refractors, but it may increase the marketability of 6" and larger refractors, making scopes of this size much more practical from a mounting standpoint. I surely hope IStar succeeds with this new project!




As an engineer, one is always skeptical. I have to wonder about this design. Tubes are generally the stiffest, lightest solution in situations where bending is important. But they must have done their homework... the beams must be hollow.

If this is successful, it looks like the refractor world will have entered into the reflector world of trusses, collimation and thermal plumes, shrouds that pass body heat and distorted images...

Jon


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Gastrol
Pooh-Bah


Reged: 11/04/11

Loc: los angeles
Re: Red Hot New Concept OTA's new [Re: Jon Isaacs]
      #5616275 - 01/10/13 09:11 PM

Why not just put that in a solid tube?

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Scott in NC
Mad Hatter
*****

Reged: 03/05/05

Loc: NC
Re: Red Hot New Concept OTA's new [Re: Gastrol]
      #5616282 - 01/10/13 09:15 PM

Quote:

Why not just put that in a solid tube?




I think their goal was to make the OTA as light as possible.


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ISTAR Optical
Vendor- IStar Optical
*****

Reged: 08/09/09

Loc: Page, Arizona
Re: Red Hot New Concept OTA's new [Re: Jon Isaacs]
      #5616643 - 01/11/13 03:44 AM

Hi John,
this is why we combined it with fully enclosed tube at the focuser end. This tube is equipped with its own baffle set and acts as a baffle by itself. This is not just a simple open frame structure scope.
cheers,
Ales


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StarStuff1
Post Laureate
*****

Reged: 04/01/07

Loc: South of the Mason-Dixon Line
Re: Red Hot New Concept OTA's new [Re: ISTAR Optical]
      #5616665 - 01/11/13 04:08 AM

Very innovative design, Ales. The MAIN reason I sold off my 6-in f/8 achro a couple of years ago was difficulty in handling the weight of that beast...both the mount and me.

But this has gotten me to thinking. I have an 102mm f/6 that is robustly built and gets little use. Some inexpensive arrow shafts, plywood plates, and black craft foam for a "tube"...


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johnnyha
Postmaster
*****

Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: Red Hot New Concept OTA's new [Re: StarStuff1]
      #5616700 - 01/11/13 05:07 AM

Very cool. I would be more comfortable with a dewshield in front of the objective as well as, say, a short extension behind the objective at least 4-6" long, to protect the glass.

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ISTAR Optical
Vendor- IStar Optical
*****

Reged: 08/09/09

Loc: Page, Arizona
Re: Red Hot New Concept OTA's new [Re: Jon Isaacs]
      #5616726 - 01/11/13 06:24 AM

Hello John,
yes, the beams are hollow of course. You are correct on the circular shape being very strong but you loose this advantage quickly with added length especially without having any cross-sections. The 3 hollow beam structure is CNC machined, each hole is perfectly lined up and with 3 cross-sections and two end sections hard-bolted to the bars the overall construction is substantially stronger compared to a single tube. Also the thermal stability is superior, owners of long refractors can tell you more about this.. Dont forget, this is still a refractor with a enclosed tube at the focuser end and with number of baffles in it. The light can not entre the focuser direct. All things mentioned has been taken in consideration. Definitely this TCR truss/enclosed tube refractor does not need collimation more frequently than any classic refractor on the market. Actually it is engineered for stability so once you get the collimation right, you wont have to touch it again for years if you handle the scope with care.
best regards,
Ales


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ISTAR Optical
Vendor- IStar Optical
*****

Reged: 08/09/09

Loc: Page, Arizona
Re: Red Hot New Concept OTA's new [Re: Dragonwatcher]
      #5616727 - 01/11/13 06:29 AM

First one of these new TCR style scopes (Truss Construction Refractor)is already listed with price. More will follow. We will replace/add this style to all scopes of 150mm and larger and F/8 and slower. In addition to this scope we have 6 more on our CAD design screens. All will be introduced one by one during 2013.
regards,
Ales


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