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Old 13-02-2018, 08:54 AM
m11 (Mel)
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Lunt 100 Double Stack halos

Hi Everyone,

I have recently got my Lunt 100mm with the DSII module.

Amazing views with the the Lunt100mm in single stack configuration. I can see the granulation, spicules and flares in fine detail.

When I have installed the Double stack module I get multiple halos that radiate from the 09:00 position and the detail is not present?

I have equalised the pressure for both pressure tuners and alter the positioning. I see more contrast and detail in single stack which I am kinda confused?

Wondering if anymore can suggest anythign I am doing wrong or I can configure?

Thanks,

m11
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Old 13-02-2018, 09:08 AM
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Merlin66 (Ken)
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Mel,
I see you also have the SM60II DS...
You've probably already used the radial positioning and variable tilt to reduce ghosting.....

In the Lunt DS I believe there's limited opportunity to have any "tilt" adjustment. A CP filter in the optical path may reduce them....

I don't have a Lunt to experiment with, so can't add much more.
There are many guys over on the SolarChat group who have Lunt experience which may be more useful.
https://solarchatforum.com/
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Old 13-02-2018, 09:51 AM
m11 (Mel)
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Hi Ken,

Yah, you are right in that I can tilt away the halos in the SM60 DSII. I get the feeling something may be off with the DSII module.

I see the red glow in single but in the double its like 4 halos in a expanding linear row. Really weird.

Thanks for replying Ken, will defintely head to solarchat.

Regards,

M11

Quote:
Originally Posted by Merlin66 View Post
Mel,
I see you also have the SM60II DS...
You've probably already used the radial positioning and variable tilt to reduce ghosting.....

In the Lunt DS I believe there's limited opportunity to have any "tilt" adjustment. A CP filter in the optical path may reduce them....

I don't have a Lunt to experiment with, so can't add much more.
There are many guys over on the SolarChat group who have Lunt experience which may be more useful.
https://solarchatforum.com/
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  #4  
Old 13-02-2018, 11:05 AM
m11 (Mel)
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halos

Hi Ken,

I am not a handy person by any means but I have eliminated the halos and reduce the glow somewhat with the double stack module.

The second pt module i mounted pretty much in the opposite direction of the first pt unit and tuned. Double stack definitely shows more detail on the disk but comparing single vs double - I prefer the single view with the 100mm.

Can upload photos if this helps others

Thanks for replying and helping me out

Regards,

m11
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  #5  
Old 13-02-2018, 11:24 AM
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Merlin66 (Ken)
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Sounds like a reasonable compromise.....
The 50% (approx) light loss when DS takes a bit of getting use to.
With practise I find the contrast enhancement worth the effort.
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  #6  
Old 13-02-2018, 11:31 AM
m11 (Mel)
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thanks

yep, the contrast is quite noticeable. At least currently there is a grouping of sunspots otherwise the sun has been pretty quiet.

I might leave my other Lunt in single to have both single and double

Love the views of the 100mm and it is a definitely huge increase for me in detail and level of magnification I can use now.

Regards,

M11
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  #7  
Old 13-02-2018, 06:04 PM
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GUS.K (Ivan)
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Hi Mel, I use a circular polarizer between the two etalons, I had a thread on CN and solarchat explaining how it was done. The image is darker but the glow is almost completely eliminated, and the quality of the image is as good as my DS Lunt 60.
Ivan
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  #8  
Old 14-02-2018, 10:11 AM
m11 (Mel)
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lunt 100mm

Hi Gus,

Thanks for the info. Will definetly look into it. I have never heard of it before. Always a learning experience

Regards,

M11
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Old 14-02-2018, 01:26 PM
m11 (Mel)
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lunt 100mm

Hi Gus,

Thanks for the info regarding solarchat with the hood and polariser. I have put an order in for both from the link to Amazon from that thread.

Do you prefer the ds II view or single stack view for the Lunt 100mm?

Thanks,
M11
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  #10  
Old 14-02-2018, 08:36 PM
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GUS.K (Ivan)
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Hi Mel. I prefer the single stack for proms and spicules, which can be quite spectacular at high power. The DS is great when there are active regions and filaments, and especially filaproms, which add that 3D feel to the DS view.
Using the polarizer, the image is darker, but I found that by rotating the lens hood by 45 to 90 deg at a time you can find a position where the image is brighter.
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  #11  
Old 14-02-2018, 09:05 PM
m11 (Mel)
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lunt 100mm

Thanks for sharing your experiences.

I must admit , I was blown away by the single stack view even with the disc view of features. It really felt like a hd view of the sun. Definetely worth the wait!

Got thr DS module at the same time but felt the view was not a big a constrast as I thought. Still a good view but the single stack really blew me away.

Thanks again for pointing me to the solarchat thread.

Regards,

M11
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  #12  
Old 15-02-2018, 12:51 AM
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AstroJunk (Jonathan)
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Its really important that you remove and refit the black part of the pressure tuners altogether when they arrive. The Lunt factory is at 2500ft above sea level, and you probably are not, so their starting pressure is likely to be too weak.

The DS view absolutely trashes the SS view, it's just a matter of getting the balance right. Reduce the pressure of the DS, tune the SS to perfection, then finesse the DS.
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Old 15-02-2018, 12:14 PM
m11 (Mel)
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lunt 100mm

Hi Astro,

Yep, I made sure i re-pressurised the tuners.

Yah, i havent found the balance as yet. Something I need to play with.

Will give it a go and see how it goes.

M11
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Old 15-02-2018, 08:38 PM
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AstroJunk (Jonathan)
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I had a peek at the sun through the 100 this morning only to find an almost featureless lump
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Old 16-02-2018, 10:57 AM
m11 (Mel)
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lunt 100mm

Hmm that sucks. There was a grouping of sunspots 2 days ago and a filament around 9 O Clock.

Will have a look this arvo to see if anything is present.

M11
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  #16  
Old 16-02-2018, 11:07 AM
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AR 2699 and large filament (about to become a filaprom?) visible towards the edge.
See:
https://www.raben.com/maps/index.html
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  #17  
Old 16-02-2018, 11:52 AM
m11 (Mel)
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lunt 100mm

Hi Merlin,

Awesomr , will be looking for it today.

Thanks also for the link to that solar site.

Regards,

M11
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