LS80 Etalon @ a 130mm f/7 Triplet

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tklemmer
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LS80 Etalon @ a 130mm f/7 Triplet

Post by tklemmer » Mon Dec 28, 2015 9:08 pm

Hello Everybody,

I've been reading through this forum for quite a while now. I'd like to introduce myselfe firsts.
My name is Thomas I'm from Germany and the solar bug has bitten me about a year ago and since then enjoyed white light and h-alpha photography of the sun a lot.

Some of my images:

White light:

Image

Image

H-Alpha:

Image

Image

Image

Image

White light was done mostly done with my C11 and for Ha I use my LS80 B1800 single stack with a ASI 174m.

So finally to my planned project:
I'm looking into getting some more resolution for H-Alpha for the next season.
So I thought about taking the etalon assembly out of the LS80 and put it into a TS 130 Triplet. I thought since both scopes have an f/7 focal ratio It should yield the best results.
Does anybody have experience with the internal ERF of the LS80? Will I need an additional front ERF for the 130mm scope?
How do I determine the optimal distance of the assembly to the front lens?
Can anybody point my too similar (LS80) mods?
Any advice or discussion is very welcome!

CS Thomas

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by highfnum » Mon Dec 28, 2015 10:06 pm

willkommen!
you came to right place
I have ls60 so - i dont know diameter of ls80 etalon-internal-erf - it about 30mm for ls60
the general idea is to match objective cone cutoff to internal erf diameter

im sure others in this forum will post to you

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by MapleRidge » Tue Dec 29, 2015 12:50 am

Hi Thomas...

Welcome to the group, and a very [no religion please] set of images that you have posted.

I have made a modded Ha scope using the DSII etalon for the LS80T and fitted it to a Celestron 150mm, f8 scope. I have a Baader 110mm ERF mounted inside the tube as well.

I did set the LS80T main etalon up as a test on this OTA, and it seemed to work ok...didn't want to loose the opportunity to image with the 80mm to get full disks so I set up the double stack module for the larger scope.

Brian
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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by tklemmer » Tue Dec 29, 2015 7:56 pm

I Brian,

do you have any images that you took with the Celestron and the DSII?

cheers
Thomas

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by MapleRidge » Sun Jan 03, 2016 12:01 am

Hi Thomas...

Sorry for the delay getting back to you.

I have posted a 'best of' 2015 message that includes many images taken with my modded 150mm, f8 Celestron OTA fitted with a Lunt DSII etalon. The last two Ha are likely the best examples in the lot of its performance.

Link to the images:
http://solarchat.natca.net/viewtopic.php?f=4&t=18468

I can send you a few pic of the modded OTA is you like as well.

Brian
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Cambray, ON Canada

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by edobosz » Sun Jan 03, 2016 1:30 am

Hi Thomas

This should work fine just as Brian has mentioned. See my similar setup in this post: http://solarchat.natca.net/viewtopic.php?f=4&t=18452

In your setup you should get the positioning of DSII so that its aperture window gets as close to the full light cone as possible. Just make sure you don't lose ability to bring system to focus if trying to maximise the matching of light cone to etalon aperture. You can determine etalon positioning by doing a ray trace diagram to see where it achieves a diameter slightly less that 35mm. Alternatively you could disconnect the focuser from where it attaches to the back of the tube and place a piece of paper over the hole whilst pointing at the sun. Mark off the diameter with a pen and see how close it is to 35mm. This would be the approximate size of the light cone at the front part of the etalon window. If you need a bigger disk, then you will need to cut the tube to move things inwards or have an adapter that is recessed into the body of the tube a little bit. If the difference is small you can live it. I expect things will be close in your system.

I use a 125mm front mounted ERF to minimise tube currents and to protect the Lunt's DSII etalon. If you do not have an ERF in front of the Lunt DSII etalon, I believe damage will likely occur!

Other more experienced modders may add or correct my comments and suggestions.

Ted
Lunt LS80THa DSII Quark Prominence ES127mm refractor

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by Derek Klepp » Sun Jan 03, 2016 5:03 am

Welcome Thomas your mod sounds similar to what Ted has done and achieved great results .Very nice WL shots look foward to your 2016 results.

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by Godzilla » Tue Feb 09, 2016 10:50 am

Hello Thomas, look my Setup:
TOA130 with LS80 / B1800. I can see the complete Sun Disc with this Setup. I hope in 2 Months i can make complete this with a DSS Modul...

Image

Image

Oh i forget: I am also comming from Germany...

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by Godzilla » Tue Feb 09, 2016 12:58 pm

My Name is Andreas, and i am also from Germany....
My Setup is: TOA130 / Baader ERF plus LS80PT / BF 1800 adaptet in the original 4" OAZ from Tak.
I can see the full Sun Disc with this config. For the next my plan is to add a DSS Module on the Back, but i am not sure this time to give the Money for the DSS Module or a CCD Cam like Atik one.....

Image

Image

Taken with Skyris 445 and 3 x Abbe Barlow.

Andreas

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by Godzilla » Thu Feb 11, 2016 10:13 pm

Please help i send some posts this week but i think i have this status:
" It is also possible that the administrator has placed you in a group of users whose posts require review before submission."
Andreas

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by marktownley » Mon Feb 15, 2016 8:07 am

sorry for the delay Andreas!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by Derek Klepp » Mon Feb 15, 2016 9:52 am

Welcome guys and look foward to your results with the Mods.

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by tklemmer » Sun Feb 21, 2016 7:56 pm

Awesome build Andreas, we need to chat!! :)

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Re: LS80 Etalon @ a 130mm f/7 Triplet

Post by tklemmer » Thu Jun 23, 2016 12:07 pm

Time to revive this thread...

My mod is finally complete, there is still some tweeking to do but so far I'm quite happy with the result.

Image
- 3x TC and an ASI 174m (will make better flats next time... )

Image

cheers
Thomas

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