Double Stack Evaluation Requested

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pdmphoton
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Double Stack Evaluation Requested

Post by pdmphoton »

Hello All,
I double stacked the 130MT Lunt with a front mounted Coronado 90mm DS etalon.
(Still getting use to tuning it as it is so different from a pressure tuned etalon.)
Seeing conditions were awful today with significant turbulence. Nonetheless I wanted to get some feedback from the group on a quick initial test.
First two images were captured with a ZWO 183mm and a 1.6X Barlow. Closeup of sunspot was captured with a 174mm and 2.5X Powermate.
Any helpful observations would be appreciated.

I will do a comparison test with the internal double stack vs. the front mounted Coronado in the next day or two when there are decent seeing conditions.

I will say, from just a quick visual comparison the front mounted setup appeared to have the edge.
130MT + 90mmDSII 1.6X Barlow 183mm copy.jpg
130MT + 90mmDSII 1.6X Barlow 183mm copy.jpg (12.26 MiB) Viewed 739 times
130MT + 90mmDSII 1.6X Barlow 183mm INV BW copy.jpg
130MT + 90mmDSII 1.6X Barlow 183mm INV BW copy.jpg (11.46 MiB) Viewed 739 times
130MT + 90mmDSII 174mm 2.5X PMT copy.jpg
130MT + 90mmDSII 174mm 2.5X PMT copy.jpg (983.1 KiB) Viewed 739 times
Thank you,
Paulm


Lunt LS80Tha DS
Lunt 130MT DS
APM 140 Doublet
Skywatcher 180mm Mak
Celestron C11 XLT
ZWO 174 and 183 Mono
iOptron CEM120
Hinode Solar Guider - Airylab SSM
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Re: Double Stack Evaluation Requested

Post by DeepSolar64 »

Paul,
I think these look good. You appear to be on band. Your top disc looks to be evenly tuned and illuminated. Something that troubles me to no end in doublestack. I think your test is successful.

James


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Orion 70mm Solar Telescope
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Meade Coronado SolarMax II 60 DS
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Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
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Re: Double Stack Evaluation Requested

Post by pdmphoton »

DeepSolar64 wrote: Wed May 22, 2024 1:38 am Paul,
I think these look good. You appear to be on band. Your top disc looks to be evenly tuned and illuminated. Something that troubles me to no end in doublestack. I think your test is successful.

James
James,
Thank you for your helpful response. I find that double stacking with the Lunt internal etalons, while convenient, presents challenges with reflections.
While there are methods to deal with the reflections the "solutions" reduce light throughput too much for my taste. I am hoping I will be able to dial in the Coronado DS unit to obtain full discs with the Lunt 130MT.


Lunt LS80Tha DS
Lunt 130MT DS
APM 140 Doublet
Skywatcher 180mm Mak
Celestron C11 XLT
ZWO 174 and 183 Mono
iOptron CEM120
Hinode Solar Guider - Airylab SSM
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Re: Double Stack Evaluation Requested

Post by DeepSolar64 »

pdmphoton wrote: Wed May 22, 2024 2:47 am
DeepSolar64 wrote: Wed May 22, 2024 1:38 am Paul,
I think these look good. You appear to be on band. Your top disc looks to be evenly tuned and illuminated. Something that troubles me to no end in doublestack. I think your test is successful.

James
James,
Thank you for your helpful response. I find that double stacking with the Lunt internal etalons, while convenient, presents challenges with reflections.
While there are methods to deal with the reflections the "solutions" reduce light throughput too much for my taste. I am hoping I will be able to dial in the Coronado DS unit to obtain full discs with the Lunt 130MT.

Good luck Paul. I think you are on your way to achieving your goal with the 130MT and Coronado etalon.

James


Lunt 8x32 SUNoculars
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
Lunt, Coronado, TeleVue, Orion and Meade eyepieces

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Re: Double Stack Evaluation Requested

Post by pupak »

The most challenging thing about the DSII is to tune them so that there is a contrasting surface and at the same time the prominences are clearly visible. I got the best results with the LS40 and Quark combo. Full discs are a demanding discipline if you want high resolution. Your photos are very good.


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Re: Double Stack Evaluation Requested

Post by marktownley »

Looks good Paul


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Re: Double Stack Evaluation Requested

Post by Carbon60 »

Looking great, Paul. You'll refine with practice.

Stu.


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Re: Double Stack Evaluation Requested

Post by MAURITS »

Well done Paul.


Regards,
Maurits

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