Lunt monster
Lunt monster
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.
Piemme
Anybody knows something more about this Lunt solar “monster”? Introduced at NEAF 2019. Thank you.
Piemme
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- marktownley
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Re: Lunt monster
I merged it with this thread viewtopic.php?f=4&t=25872
http://brierleyhillsolar.blogspot.co.uk/
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Re: Lunt monster
No worries! It's been a hot topic today.
http://brierleyhillsolar.blogspot.co.uk/
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- 04Stefan07
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Re: Lunt monster
That thing is freaking huge.
70k USD!
70k USD!
SOLAR SCOPES: Lunt LS50THa Pressure Tuned with B600 filter & Moonlite Focuser, Daystar Quark Chromosphere
MOUNTS: Skywatcher HEQ5 Pro & Skywatcher Star Adventurer
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MOUNTS: Skywatcher HEQ5 Pro & Skywatcher Star Adventurer
CAMERA: Player One Neptune-M & Flea3 1.3 MP Mono USB3
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Re: Lunt monster
Late question: Is there any evidence for improved or inferior images from a skeleton refractor OTA?
http://fullerscopes.blogspot.dk/
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
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Re: Lunt monster
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!!
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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Visual Observer
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Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
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Re: Lunt monster
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?
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?
http://fullerscopes.blogspot.dk/
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
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Re: Lunt monster
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
Thank you for that information George.
http://fullerscopes.blogspot.dk/
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
H-alpha: Baader 160mm D-ERF, iStar 150/10 H-alpha objective, 2" Baader 35nm H-a, 2" Beloptik KG3,
Lunt 60MT etalon, Lunt B1200S2 BF, Assorted T-S GPCs or 2x "Shorty" Barlow, ZWO ASI174.
- Bob Yoesle
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Re: Lunt monster
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.
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
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
George
- marktownley
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Re: Lunt monster
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.
http://brierleyhillsolar.blogspot.co.uk/
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Re: Lunt monster
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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Curiosity is the father of knowledge; uncertainty is the mother of wisdom.
Dark-Sky Defenders
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Curiosity is the father of knowledge; uncertainty is the mother of wisdom.
Dark-Sky Defenders
Goldendale Observatory