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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]
      #5616730 - 01/11/13 06:36 AM

This TCR style (Truss & rear tube construction) will be introduced for all Achromats, all R30/ R35 doublet OTAs and all large APOs or semi APO triplets. The main goal was to reduce weight to a bare minimum and we achieved an average reduction of fully loaded OTA weight by over 50 percent. So these scopes weight less than half compared to their fully enclosed tube brothers. So there is no need to get into larger, more expensive mount. It is better to get a super lighweight scope instead.

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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: Istytray]
      #5616732 - 01/11/13 06:45 AM

Term "Game Changer" is direcly related to superior weight reduction while keeping all important aspects of an enclosed tube construction intact. We achived over 50 percent weight reduction compared to fully enclosed tube models while keeping the resolution at similar levels. So if an 8" refractor can weight same as 6" model only yesterday I think the term was well chosen. Thank you all for your comments.
cheers,
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: Scott in NC]
      #5616735 - 01/11/13 06:54 AM

It is planned for those who may possibly need it, as per info we already released on this product. Same with a special dew shield.
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: bluestar]
      #5616741 - 01/11/13 07:01 AM

Total of 4 baffle sections in this particular model. They are properly positioned as per ray trace computer simulation. Again, another similarity with truss scope reflector (SC, Newt...) ends right here. Even though this model look extremely simple and straight forward we put a lots of thoughts into it's development and we evaluated every single aspect of its theoretical performance. Now after first two tests under stars Im happy to say that we were right.
cheers,
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: Istytray]
      #5616746 - 01/11/13 07:09 AM

We have 3 finished and other 8 models in different aperture sizes and F-ratios now in prototype development stages. All will be introduced this year.

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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: Gastrol]
      #5616749 - 01/11/13 07:11 AM

Because than the entire quest for a super low weight refractor would be over with

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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: Scott in NC]
      #5616753 - 01/11/13 07:14 AM

Dear Scott,
you are absolutely right. This concept is not needed for small sized refractor. This is why we will offer these only for the following apertures: 150, 160, 180, 204, 220, 250mm. Bigger you go, more benefit there is to gain, especially if you combine with R30 SLIM lenses (weight cut down by 40 percent on average)
cheers,
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: StarStuff1]
      #5616759 - 01/11/13 07:21 AM

Yeap.. go for it.. but use light materials, try to stay away from plywood. You can get these aluminum or alloy bars pretty much anywhere (but make sure to get those with strict tolerances intended for further CNC work.. stay away from those made for garden fence poles..) and we dont mind ATM-ers to use this idea in parts or whole. I just "cant wait" to hear all the bad and ugly things about this fancy scope design style... something one man can not avoid...

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meade4ever
sage
*****

Reged: 08/23/07

Re: Red Hot New Concept OTA's new [Re: ISTAR Optical]
      #5616767 - 01/11/13 07:30 AM

Ales I can only be admirative by all the new concepts ISTAR offer to our hobby and especially custom work, that I hope will continue.
Even if I prefer the look of traditional refractors, the weight reduction is a great advantage.

How about the prices vs original models ?


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Thomas Karpf
Carpal Tunnel


Reged: 02/09/09

Loc: Newington, CT
Re: Red Hot New Concept OTA's new [Re: ISTAR Optical]
      #5616784 - 01/11/13 07:50 AM

Quote:

First one of these new TCR style scopes (Truss Construction Refractor)is already listed with price.




Perhaps I'm being blind. On which page is the price?

Nevermind. It's on http://istar-optical.com/istar_009.htm . $2177 for 6" f/12 achromat, about $300 more than the 'tubed' version.


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csrlice12
Postmaster
*****

Reged: 05/22/12

Loc: Denver, CO
Re: Red Hot New Concept OTA's new [Re: ISTAR Optical]
      #5616866 - 01/11/13 09:02 AM

Wouldn't there be thermals from your body when viewing near the zeinith????

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t.r.
Post Laureate
*****

Reged: 02/14/08

Loc: Upstate NY
Re: Red Hot New Concept OTA's new [Re: csrlice12]
      #5616882 - 01/11/13 09:13 AM

As Jon pointed out, I'm sure you would have to deal with all the same things truss reflector owners deal with, but on a much smaller scale of course. At first glance, it seems to delete the positive attributes a refractor is known for. Still, the design is interesting. I have wanted a 180 F/12 for some time, but with better correction than a standard C-F. Maybe this is worth a try...I certainly like the idea of less weight and mass in a scope of this size!

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csrlice12
Postmaster
*****

Reged: 05/22/12

Loc: Denver, CO
Re: Red Hot New Concept OTA's new [Re: t.r.]
      #5617035 - 01/11/13 10:57 AM

I imagine cool down would be a "breeze" though.....

Nice looking scope, may change the definition of a 1000mm f10 to a "GrabnGo".....


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hottr6
Carpal Tunnel
*****

Reged: 06/28/09

Loc: 7,500', Magdalena Mtns, NM
Re: Red Hot New Concept OTA's new [Re: mikey cee]
      #5617048 - 01/11/13 11:06 AM

I'm impressed that iStar use magnesium alloy for the tube and baffles. However, if ever you have seen magnesium burn, the OP subject title of "red hot" may not be the best choice of words.

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bcuddihee
Carpal Tunnel
*****

Reged: 11/04/06

Loc: Cincinnati Ohio
Re: Red Hot New Concept OTA's new [Re: ISTAR Optical]
      #5617064 - 01/11/13 11:13 AM

Ales, as an industrial designer I can truly say that you have created a functional and elegant design here. Out of the box thinking combined with a true aesthetic sense have really opened up Pandora's box here...in a very good way. Wishing you all the success you deserve.
Brendan


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Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Red Hot New Concept OTA's new [Re: ISTAR Optical]
      #5617091 - 01/11/13 11:31 AM

Quote:

All will be introduced one by one during 2013.
regards,
Ales




will you bring any to NEAF?


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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: bcuddihee]
      #5617092 - 01/11/13 11:31 AM

Hello Brendan,
thank you so much for your wonderful comment. I truly appreciate that from someone like yourself.
respectfully,
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: Pinbout]
      #5617101 - 01/11/13 11:37 AM

Hello Danny,
we will definitely bring these to NEAF.. and hopefuly more than just one. By that time we should have the 180 and 204mm versions available too to demonstrate that even 8" refractor no longer requres an expensive mount and can be handled by one man. For sure we will have at least this 6" F12 there...
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: meade4ever]
      #5617124 - 01/11/13 11:46 AM

Meade4Ever,
at this moment we can offer these with some 15 percent increase over the standard models. But we are working hard on narrowing this gap as much as we possibly can. I want anyone who can afford the traditional design scope to be able to afford this TCR low weight variation.
Cheers,
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: csrlice12]
      #5617139 - 01/11/13 11:54 AM

Yes, the cooling time takes nearly one third of the original time required. We tested two lenses so far. From 1,5 hours on classic enclosed tube to 40 minutes here. Temperature difference was 15° Celsius. This is one of those very important aspects and improvements. And if you blow a fan at the lens you can have it done in 15 minutes... nice. We found out that you should optimally use the forced air flow like 10 minutes front and 5 minutes rear. But it does make sense... . If you blow air from only one direction you need additional time to have the temperature evenly distributed throughout the lens set.

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