Lunt monster

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Piemme
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Lunt monster

Post by Piemme » Sun Apr 07, 2019 8:48 pm

Don’t know what happened but the thread disappeared. I will try again.
Anybody knows something more about this Lunt solar “monster”? Introduced at NEAF 2019. Thank you.
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Re: Lunt monster

Post by Piemme » Sun Apr 07, 2019 9:09 pm

I did’t see it, sorry



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Re: Lunt monster

Post by marktownley » Sun Apr 07, 2019 9:10 pm

I merged it with this thread viewtopic.php?f=4&t=25872


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Re: Lunt monster

Post by marktownley » Sun Apr 07, 2019 9:14 pm

Piemme wrote:
Sun Apr 07, 2019 9:09 pm
I did’t see it, sorry
No worries! :) It's been a hot topic today.


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Re: Lunt monster

Post by Liam » Tue Jul 16, 2019 10:46 am

I want to see it live. Really a monster!!!!



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Re: Lunt monster

Post by 04Stefan07 » Fri Aug 23, 2019 5:12 am

That thing is freaking huge.

70k USD!


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Re: Lunt monster

Post by Rusted » Tue Sep 10, 2019 7:48 am

Late question: Is there any evidence for improved or inferior images from a skeleton refractor OTA?


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Re: Lunt monster

Post by DeepSolar64 » Wed Sep 11, 2019 4:41 am

Many truss-type reflectors perform very well and no really large professional reflector has a solid tube. All are skeleton-like truss designs on altazimuth mounts. One very notable exception is the 200 inch Hale telescope. It is mounted equatorially but naturally still has an open framework design. Most large amateur dobsonians are truss designs.

I don't see why a truss design wouldn't work well with a refractor. Just few are really big enough to need it!!


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Re: Lunt monster

Post by Rusted » Wed Sep 11, 2019 5:07 pm

Thanks. Having built a folded version of my 7"/180mm f/12 in a sturdy frame I should really know the answer myself.
I found frequent dewing of the internal optics more of a problem than image quality.
That was for WL night time use in winter rather than year-round solar.

I'd rather not submit my optical flats to focused sunlight from my 7" lens using my 90mm internal D-ERF.
My 10' dome is not large enough for my straight tubed 7" with all the PST extensions dangling off the back.
So I'd have to use the folded form and wondered about thermal effects of an open tubed refractor in sunlight.
Reflectors are not much used for solar. So there isn't much anecdotal evidence of instrumental seeing problems.
But now I am digressing even further from the OP's thread... I'm guessing they [Lunt] are using a full aperture D-ERF?


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Re: Lunt monster

Post by george9 » Thu Sep 12, 2019 8:35 pm

The first lens is a 304mm f/7 doublet that looks clear but blocks IR. The second section also has a clear-looking element. The last section has a mirror-like element at the entry. George



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Re: Lunt monster

Post by Rusted » Fri Sep 13, 2019 3:50 pm

Thank you for that information George.


http://fullerscopes.blogspot.dk/

Baader 160mm D-ERF, iStar 150/10 H-alpha, Baader 35nm H-a, Beloptik KG3, PST etalon, Lunt B1200S2, ZWO ASI174.

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Re: Lunt monster

Post by Bob Yoesle » Wed Oct 23, 2019 1:55 pm

Just visited with Brian at Lunt where this telescope is located... an impressive instrument when seen up close and personal.

Objective has ERF coatings.

Middle section has a large tilted precision polished optical window with additional ERF coatings.

Open tube design in order to prevent build-up of heat and tube currents. Carbon fiber truss tubes to maintain accurate spacings.

Third ERF at the front of the end section ahead of the etalon module.

Internal double stacked 100 mm unobstructed etalons in separate pressure tuned cavities, separated by a professional quality (i.e. expensive) one - off custom made circular polarizer: collimator - etalon - window - CP - window - etalon - refocusing lens.

Apparently a state-of-the-art statement and research grade instrument - definitely not a "consumer grade" recreational solar instrument... Unfortunately it was not set up for viewing through. While insanely expensive, you have to hand it to Lunt for building such an instrument - you don't see this level of effort from any other solar OEM.


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Re: Lunt monster

Post by george9 » Thu Oct 24, 2019 3:45 am

Thanks, Bob. I hope they set it up at NEAF. Imagine full disk views through an 12" H-alpha scope. With a 13mm Ethos, you would still be full disk at 160x. And you can binoview those. Or 70x in a 31mm Nagler. If the contrast is like my LS80 DSII with the circular polarizer--and I assume it is better--then it is hard to imagine a better set up. Practical (for amateurs) or not, it is fun and informative.

George



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Re: Lunt monster

Post by marktownley » Thu Oct 24, 2019 8:55 pm

A 100mm internal etalon with 300mm objective would mean that the sweet spot would be smaller than that of PST. You could see the whole full disk with this but not all of it would be on band.


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Re: Lunt monster

Post by Bob Yoesle » Fri Oct 25, 2019 4:28 pm

Agreed Mark, Indeed it would theoretically be even smaller, since the FWHM of the PST is generrally closer to 0.1 nm, and a double stacked air spaced etalon is less than 0.05 nm; the Jacquinot spot is proportional to the square root of 2 x the FWHM.


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