H-Alpha Double-Refractor ?

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H-Alpha Double-Refractor ?

Post by Solar-Cologne » Thu Nov 12, 2015 6:35 am

Hello,

I am a new ;Member here and my Name is Achim, from Cologne/Germany.
Sorry, but my english is not so good, i hope, i learn a little bit here in SolarChat :D

I am an Hobby-Astronomer since 6 Years started with an old TASCO Newtonian 114/900.... :mrgreen:
By the Time, i learn it to love our Sun.

I found the way in this Chat, because i want to have worldwide Connections with H-Alpha-Telescope Users.
Why ?
I am inquisitive in H-Alpha especially selfmade Telescopes.
At assemblies Scopes, i use two Coronado-PST, and a third PST-Etalon in an Aluminium case, mecanical Tuning, T-2 Adaption with an Baader TZ-4 Telezentrik.
By the Time i made a selfmade Scope with PST-Conversation and one with Lunt60-Conversation.
My last Step is an old Meade ED-178 with f=30, Doublestack. Its in work.

My Dream is an H-Alpha Double-Refractor with two C-ERF and min. 120mm Diameter or greater, without Frontetalons, at the end the Matsumoto Two-Mirror-System.

Is there anybody, using a Binocularscope like this ?
Or has somebody the same dream...?

PS:
My best H-Alpha Friends are Oliver Smie / http://beloptik.de/ and Wolfgang Lille / http://sonnenfernrohr.de/
I am lucky to know them both.

sunny Greetings :D
Achim

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Re: H-Alpha Double-Refractor ?

Post by Derek Klepp » Thu Nov 12, 2015 8:54 am

There will be someone here with knowledge Achim.I am still learning just basic modding.
Don't forget to post some pictures of your scopes.

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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Thu Nov 12, 2015 10:39 am

Hello Derek,

oh my, i have a lot of Sun-Scopes.... :mrgreen:

I dont wont to make a mistake here in Solarchat.
In which Board i can post my Pictures ?

sunny Greetings :D
Achim

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Re: H-Alpha Double-Refractor ?

Post by marktownley » Thu Nov 12, 2015 7:21 pm

Hi Achim, welcome to the forum! You certainly have a lot of scope setups there. Never tried the binocular scopes like you talk about, but certainly sounds interesting. You can post your pictures in any of the boards here. :)
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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Fri Nov 13, 2015 7:16 pm

Hi Mark,

My Plan is to build a H-Alpha Binoscope with my self made 6" f8 FH-Binoscope with Matsumoto Mirror-System, with the build in Pentax 6x7 Helicoid-Focussers to adjust the Eye-Diameter.

I build it, because i like the big Fujinon 150 Binoculars.
My Scope is better than the Fujinon, because i can up to 300x .... :D
The Fujinon has a shorter focalratio and the wider Field....ok.

This Refractors are the older Bresser types from the Year 2000, not adjustable Lenses.
I have two Al Jaegers 6" f8 brand new Lenses.
now, i will make the Adapters for the Jaegers, they are 10 Times better than the Bresser, like an Semi-Apo....wouw.

I have two W.Lille C-ERF, one 135mm and the other 160mm and two PSTs,

I need only five Adapters and a second Zeiss-Abbe-Barlow to make a self-made 120mm H-Alpha-Binoscope.

sunny Greetings :D
Achim
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Re: H-Alpha Double-Refractor ?

Post by marktownley » Sat Nov 14, 2015 8:41 am

Wow, that is a cool setup!
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Re: H-Alpha Double-Refractor ?

Post by MapleRidge » Sun Nov 15, 2015 2:48 am

Welcome Achim...

That bino scope is rather unique...it will be interesting to follow this project as it develops.

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Re: H-Alpha Double-Refractor ?

Post by Valery » Mon Nov 16, 2015 1:44 pm

I am envious with the green background and ground everywhere there. This is the nicest environment for a good solar seeing which is the key in this hobby.


Valery.
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Re: H-Alpha Double-Refractor ?

Post by Bob Yoesle » Mon Nov 16, 2015 5:58 pm

Hi Achim,

Impressive, but I'm not sure it would be the best approach.

1. OTA alignment seems like it might be a problem in order to get coincident visual fields.

2. For the twin scope you will need two etalons. Internal collimated etalons with the PST collimator-etalon-refocus lenses would be very complex with the Matsumoto mirror system and Pentax focusers. Using telecentric based filters (DayStar, Solar Spectrum) will give you a huge EFL, making OTA and internal optical alignment issues even more critical.

3. There are no commercially available front etalons over 100 mm in diameter. They are expensive, and you would need two. It would be better to use them double stacked on a single OTA with a binoviewer.

I certainly don't want to discourage you from trying, but in the end, you would probably be better off using a single 120 mm objective with a LS 60 or (better) LS 80 internal etalon system, with the appropriate DSII for double stacking if desired, and using a binoviewer.

Just my 2 cents worth...
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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Tue Nov 17, 2015 11:18 pm

Hello sun-friends,

Thanks for interesting this project.

Bob,

My thoughts to built this scope, I discussed with Oliver Smie.
Our first plan was to use the brand new Daystar-Quarks.....fine, a good idea.
We think, its a very good h-alpha-component, and its the right time when started in the market.

We speak with M.Ludes APM/Telescopes, if the next batch arrive here in Germany we want to test them all and i get two of the best one...... :D
But whats happend.....they all are, to put it mildly, not so good..... we were disappointed :cry:

What we can do ?
Then it occurred to me, to use my two Coronado-PSTs.
All components are available, its cost me no money, only the five adapters..... :D

At next time i will test it, with two friends, with a single refractor, to put the etalon between the tube and the Matsumotos and the blockingfilter with barlow and eyepiece on the top

Oliver said, it will work.....maybe later, we will see... :idea:
---------------------------------------------------------------------------------
About the biggest Frontetalons:
Today, i ask Wolfgang Lille, he knows all about H-Alpha components.
Coronado has only built 5 pieces of a 140mm fronetalon in about the Year 2000 or earlier. It costs about 32.000,- DM, old German D-Mark, 16.000,- €.
But when they build it today, i think it costs 32.000,-€.
One User in Germany has two of them....not me.... :D

sunny Greetings :D
Achim

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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Mon Mar 23, 2020 6:17 am

Hello Sunny Girls and Boys,

After a long period of Astro-abstinence........becaus i have more Hobbys......Highend HiFi.......and Motorcycles.......and my best Astrofriend Sascha, he was an H-Alpha Enthusiast too and my Parents died. :cry: :cry: :cry:

Now i will new started the 120mm H-Alpha Doublerefraktor Projekt, because I'm a purely visual H-Alpha observer.

I got the latest ones of Matsumoto EMS U-L with silver coated Mirrors....97,5 % Reflction and 148mm Lightpath.

http://ems-bino.com/ems-product-line-english/

The average reflectivity through the visible spectrum per one mirror is as high as 98.5 percent, and 97 percent of the incoming light is secured even after 2 times of reflections.

I have two very good original C-ERFs 135mm and 160mm

Two Skywatcher 6" f8 Refraktors, very good for H-Alpha.

Two Coronado PSTs

Two Matsumoto EMS U-L

Now, i need some Adapters to built this Binoscope......later.

Yesterday i watched the sun for the first time in this Year 2020 with my single 120mm 6" f10 PST.



sunny Greetings :D
Achim
6_120mm_f10_H-Alpha_01.jpg
6_120mm_f10_H-Alpha_01.jpg (381.42 KiB) Viewed 251 times
6_120mm_f10_H-Alpha_02.jpg
6_120mm_f10_H-Alpha_02.jpg (395.23 KiB) Viewed 251 times
Last edited by Solar-Cologne on Thu Mar 26, 2020 10:25 pm, edited 3 times in total.

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Re: H-Alpha Double-Refractor ?

Post by marktownley » Mon Mar 23, 2020 8:23 am

Looks good Achim. What happended to the 2 scopes from earlier in the post?
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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Tue Mar 24, 2020 6:12 am

Good morning Mark,

The 2 telescopes are still available.......I said it in the last post

:band2

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Re: H-Alpha Double-Refractor ?

Post by robert » Thu Mar 26, 2020 7:16 am

Let us know how you get on! 🙄
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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Thu Mar 26, 2020 10:28 pm

I have now also received a second Zeiss-Abbe Barlow at a ridiculously low price.

Sometimes i will use a 0,5 x Reducer 1-1/4".

W. Lille now produces the necessary adapters for me.

Waiting.......

sunny Greetings from Cologne
Achim

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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Fri Mar 27, 2020 5:10 am

I will send you a PM

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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Sat Mar 28, 2020 6:52 am

I stupid ...... enlightenment came to me this morning. 💡

I have a one-off production of a PST etalon, built into a red anodized aluminum housing, which can be tilted from the outside

T-2 adaptation and mounted afocal original PST lens system, removable to use a real telecentric.

So screwed the afocal lens system back in and looked into my adapter box ......

Hooray, everything is there.

I first fix the PST block filter unit without PST-ERF with silicone or similar material to test.

Now I'm curious to see if I come into focus .......

sunny Greetings
Achim

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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Sat Mar 28, 2020 4:54 pm

Today I was able to test.

A friend helped me with that.

One of the two Skywatcher 6 "f8 refractors with 135 C-ERF and the adapted PST tiltable etalon saddled on the EQ-8.

Then sighted the sun.

My friend operated the focuser and the tiltable PST etalon.

I held the block filter unit (without PST ERF) on the 1-1 / 4 "nozzle with both hands.

I learned that Sahara dust is in the atmosphere, so I didn't see Venus in the daytime sky.

No H-Alpha in the sun, very dark sun through the dust .... but we both saw the Etalon-Donat, which tipped over the surface of the sun ..... so this the focus

..... i am Very Happy.

I will use the tiltable etalon on one refractor and the original etalon on the second.

Now I can take the measurements and take care of the adapters.

In the second photo you can see the focus when the block filter is attached.

sunny Greetings
Achim
PST-Kippetlon an EMS-02.jpg
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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Sun Mar 29, 2020 11:22 pm

I had a next Idea..... :idea:

I have already found an inexpensive adapter solution. :D

The lower PST socket under the BF 5 has an M33 x 0.75 thread.
The 1-1 / 4 "eyepiece holder has 31.8mm.
I will have it turned 5mm deep to 33mm and glue the lower PST socket there.

Now I need only 3 adapters .... but I currently have no more money .... broke.

First of all to mount the PST etalon on a 2 "focuser, as AOK-Swiss also offers. It is too expensive for me.

An adapter with an M50x1 internal thread and 2 "internal dimension to insert the etalon into the Matsumotos.

At least a adapter with rear T-2 external thread and front 2 "external dimension to mount the PST tiltable etalon on a 2" focuser.

Then I can finally pamper my eyes. :D :D :D

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Re: H-Alpha Double-Refractor ?

Post by Solar-Cologne » Mon Mar 30, 2020 9:47 am

Well, progress is slow ... unfortunately, too slow. :cry:

My workshop for turning work, where Mathias Wirth / APM M.Ludes has his parts made, is fully booked.
I persuaded him tomorrow to at least quickly expand the two 2 "/ 1-1 / 4" reducers for the lower PST block filter nozzle to 33mm.
And it will be cost 10,-€....cool
So I can glue the two sockets there.
I can be very persistent when I have a goal in mind. :D :D :D

I try to keep the total costs under 4000, - €.

With two Baader 1.25x glass path correctors I can use 135mm aperture !

Sunny Greetings
Achim

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