Search found 119 matches
- Mon Jul 13, 2020 11:33 am
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
I tested another variant on Sunday. I temporarily installed my Lunt BF 1200 Blockingfilter on the left side. Wouw .... the view is much calmer and you can directly see through the eyepiece without Barlow. Now I have to save to buy a second Lunt BF 1200 Blockingfilter. Or does someone of you have ano...
- Mon Jul 13, 2020 11:20 am
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
Hello Sun Friends. The H-Alpha Bino is finally done. The Bino won no beauty award ..... :) It works ...... but the look insight into all tested eyepieces is much too restless with the PST Blockingfilter and the Zeiss-Abbe Barlow. It is not possible to observe with two eyes ..... too bad. I am a litt...
- Thu Jul 09, 2020 4:03 pm
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
Well, finally, adapt the 160 C-ERF to the 6 "lens. It is an aluminum lightweight construction by Matthias Wirth. I attached two small plastic washers to one of the retaining screws so that the ERF does not sit flat on the lens to avoid internal reflections. Since the frame is a bit larger, I cu...
- Sun Jun 28, 2020 5:32 am
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
Hello friends of the sun. I went on vacation for several weeks in the German Eifel, near Laacher See. After several attempts to solve the second PST etalon, I finally found a locksmith that has all the tools necessary to solve Locktite bonds. The locksmith told me that we need at least 300 degrees C...
- Sun May 03, 2020 6:57 pm
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
Hello Brian,
Nothing works with my hair dryer.
I'm looking for a hot air gun and big water pump pliers.
sunny Greetings
Achim
Nothing works with my hair dryer.
I'm looking for a hot air gun and big water pump pliers.
sunny Greetings
Achim
- Tue Apr 14, 2020 7:20 am
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
Tatsuro Matsumoto in Japan builds very high precision. It is not for nothing that Markus Ludes / APM and Matthias Wirth use often this EMS 60 ° two-mirror system. https://www.cloudynights.com/topic/665486-hello-my-dream-lzos-triplet-apo-1521200-bino/ https://www.apm-telescopes.de/de/fernglaeser/gros...
- Tue Apr 14, 2020 6:54 am
- Forum: This is SolarChat !!
- Topic: Sun Rising 08.04.2020
- Replies: 6
- Views: 2831
Re: Sun Rising 08.04.2020
I thank you all for these positive comments. :D It was wonderful to be able to consciously watch the entire sunrise with my own eyes. The first time I didn't take photos but sitting in a camping chair and watched the sunrise in peace ..... madness. I will do that more often now, it slows down in thi...
- Mon Apr 13, 2020 2:58 pm
- Forum: This is SolarChat !!
- Topic: Sun Rising 08.04.2020
- Replies: 6
- Views: 2831
Sun Rising 08.04.2020
Here are a few impressions of the sunrise on April 8th, 2020
sunny Greetings
Achim
sunny Greetings
Achim
- Sun Apr 12, 2020 10:19 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: DSLR for H-Alpha ?
- Replies: 7
- Views: 3848
Re: DSLR for H-Alpha ?
Yes Mark
for just 32 shots the result is very amazing, especially as a 16 MP Tiff.
Next time I will take some 100 pictures.
for just 32 shots the result is very amazing, especially as a 16 MP Tiff.
Next time I will take some 100 pictures.
- Sat Apr 11, 2020 7:43 pm
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: DSLR for H-Alpha ?
- Replies: 7
- Views: 3848
Re: DSLR for H-Alpha ?
Here i found them, from January 2013
- Sat Apr 11, 2020 6:47 pm
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: DSLR for H-Alpha ?
- Replies: 7
- Views: 3848
Re: DSLR for H-Alpha ?
Hi Mark,
I have to search my hard drive.
Once on the Lunt LS60Ha BF1200 with a Panasonic Lumix G3, astromodified, made " ONLY " 32 RAW images of the full disk and processed it with AviStack.
I have to search my hard drive.
Once on the Lunt LS60Ha BF1200 with a Panasonic Lumix G3, astromodified, made " ONLY " 32 RAW images of the full disk and processed it with AviStack.
- Sat Apr 11, 2020 8:52 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: DSLR for H-Alpha ?
- Replies: 7
- Views: 3848
DSLR for H-Alpha ?
Hello everybody.
Has anyone ever used a DSLR camera for H-Alpha photography ?
APS-C or Four-Thirds / Micro Four Thirds, with Mirror or Miirrorless, or a IR-modified one ?
sunny Greetings
Achim
Has anyone ever used a DSLR camera for H-Alpha photography ?
APS-C or Four-Thirds / Micro Four Thirds, with Mirror or Miirrorless, or a IR-modified one ?
sunny Greetings
Achim
- Fri Apr 10, 2020 8:59 am
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
What do You mean with "normal star diagonals" ?
The Mirror-System ?
http://ems-bino.com/ems-product-line-english/
Yes, a big difference.
The image is like a pair of binoculars, upright and sideways ..... very important for our brain.
The Mirror-System ?
http://ems-bino.com/ems-product-line-english/
Yes, a big difference.
The image is like a pair of binoculars, upright and sideways ..... very important for our brain.
- Thu Apr 09, 2020 10:12 pm
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
Still waiting ..... My metalworker only managed to make the adapters after Easter ..... a very lucrative order came in between.
- Tue Apr 07, 2020 4:39 am
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
Today it should be cloudy ... tomorrow, Wednesday again sunshine.
- Mon Apr 06, 2020 5:34 pm
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
Hi James, Read my last Post about a Binoviewer, please. "t sounds like your single-stack has better contrast than my double stack does." It was not for nothing that Lunt / APM chose it for a test in Germany .... I better not say more......i am very happy with this Scope. sunny Greetings Ac...
- Mon Apr 06, 2020 5:29 pm
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
Hello Marty, Congratulations on 200mm H-Alpha .... wouw. And a warm welcome among the visual sun watchers. :D I like the complete disk with binoviewer in my LS60Ha too.....without Doublestack. Yes, a Binoviewer is a "must have". At best a widefiild binoviewer from Zeiss 28mm diameter from ...
- Mon Apr 06, 2020 12:02 pm
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
Hi Mark,
Me too ... because man / woman knows what you have.
The last adapter comes on Wednesday ..... waiting.
Me too ... because man / woman knows what you have.
The last adapter comes on Wednesday ..... waiting.
- Mon Apr 06, 2020 6:44 am
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
Good morning James, My LS60Ha BF 1200 without pressure tuning is single stack. It was the test device from M.Ludes / APM here in Germany, for the test for the magazine "Stars and Space". Lambert Spix, author of Moonhopper, received it for testing Lunt / APM. Through small detours I was ver...
- Sun Apr 05, 2020 1:25 pm
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
Hello sun friends, Today also a mercilessly good seeing in the sun. Lunt 60Ha BF 1200 with BG38, Zeiss-Abbe-Barlow with KlickLock 2.25 x and Lunt Zoom to a whopping 7.2mm ...... 156x ..... Wouw! :D And with the BG38 prefilter !!! This is not a fairy tale, anyone who knows me knows that ..... profita...
- Sun Apr 05, 2020 9:30 am
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
If someone has a question to implement a visual H-Alpha telescope with their existing equipment, I will be happy to help with advice and action.
Oliver Smie and Wolfgang Lille as well.
We often talk to each other on the phone.
Oliver Smie and Wolfgang Lille as well.
We often talk to each other on the phone.
- Sun Apr 05, 2020 9:16 am
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
I am currently widening the hand-guided fork mount by Stefan Schimpf / Astromechanik.
It was previously designed for a 2 x 120 FH bino.
My 2nd PST cannot be disassembled at the moment .......
The adhesive, similar to Locktite, sticks enormously.
sunny greetings
Achim
It was previously designed for a 2 x 120 FH bino.
My 2nd PST cannot be disassembled at the moment .......
The adhesive, similar to Locktite, sticks enormously.
sunny greetings
Achim
- Fri Apr 03, 2020 10:19 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Protuberance approach vs. Coronograph
- Replies: 19
- Views: 9510
Re: Protuberance approach vs. Coronograph
Hello Christian and Alexandra, Please read my Post from 05:08 am This article is from " Spectrum of science" https://www.spektrum.de/lexikon/physik/koronograph/8382 Alexandra, On your Baader approach is written in German .... Solar Prominence Viewer. It means a Protuberance approach. Best ...
- Fri Apr 03, 2020 7:40 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Protuberance approach vs. Coronograph
- Replies: 19
- Views: 9510
Re: Protuberance approach vs. Coronograph
Hello Alexandra,
Very very nice....But it is a Protuberance approach....not a Coronograph !
Achim
Very very nice....But it is a Protuberance approach....not a Coronograph !
Achim
- Fri Apr 03, 2020 5:44 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: My W. Lille Components
- Replies: 10
- Views: 5134
Re: My W. Lille Components
You can take beautiful H-Alpha photos with it .....like this.
viewtopic.php?f=4&t=18129
sunny Greetings
Achim
viewtopic.php?f=4&t=18129
sunny Greetings
Achim
- Fri Apr 03, 2020 5:08 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Protuberance approach vs. Coronograph
- Replies: 19
- Views: 9510
Re: Protuberance approach vs. Coronograph
Coronograph, special telescope according to B. Lyot for observation and photography of the corona in the darkened sun. Since the surface brightness of the sun disk is 106 times greater than that of the corona, an artificial eclipse is carried out in the coronograph. For this purpose, a picture of th...
- Fri Apr 03, 2020 4:17 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Protuberance approach vs. Coronograph
- Replies: 19
- Views: 9510
Protuberance approach vs. Coronograph
Hello Sun Enthusiasts, I've read here in a few of your posts more often: "I used a coronographer". But I see pictures of prominences. This is not correct. So you used a prominence approach. A coronographer shows an artificial sun corona ! https://en.wikipedia.org/wiki/Coronagraph https://t...
- Thu Apr 02, 2020 9:05 pm
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
Today i tested one Refraktor for my Binoscope 120mm Aperture 6"f8 (H-Alpha f=10 ) with 135er C-ERF, PST-Etalon, Matsumoto EMS U-L, erecting Mirror System, PST BF 5mm a little bit tilted without the original ITF-Filter, Zeiss-Abbe Barlow with ClickLock 2,25 x and a Microskopocular WF 20x ( 12,5m...
- Thu Apr 02, 2020 8:51 pm
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
What I forgot, very important for a visually Scope: All H-Alpha components except an internal etalon are installed slightly tilted. The ERF filter and the block filter to banish the reflections from the optical axis, Today i tested one Refraktor for my Binoscope 120mm Aperture 6"f8 (H-Alpha f=1...
- Thu Apr 02, 2020 7:02 pm
- Forum: This is SolarChat !!
- Topic: Some images from 2019
- Replies: 12
- Views: 4899
Re: Some images from 2019
Hello Stu,
Wouw....i like your Collection too......more....
sunny Greetings
Achim
Wouw....i like your Collection too......more....
sunny Greetings
Achim
- Thu Apr 02, 2020 1:08 pm
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: My W. Lille Components
- Replies: 10
- Views: 5134
Re: My W. Lille Components
Hello everybody.
I already presented the telescope here in November 2015......look a my Avatar picture.
viewtopic.php?f=9&t=18174
sunny Greetings
Achim
I already presented the telescope here in November 2015......look a my Avatar picture.
viewtopic.php?f=9&t=18174
sunny Greetings
Achim
- Thu Apr 02, 2020 6:42 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: My W. Lille Components
- Replies: 10
- Views: 5134
Re: My W. Lille Components
James,
Oh yes it does, very well.
Oliver Smie says this is the H-Alpha Champions League
sunny Greetings
Achim
Oh yes it does, very well.
Oliver Smie says this is the H-Alpha Champions League
sunny Greetings
Achim
- Thu Apr 02, 2020 5:50 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: My W. Lille Components
- Replies: 10
- Views: 5134
Re: My W. Lille Components
Second, the 50/50 H-Alpha system. A 50mm Fabry-Perot etalon 0.7A from Solarscope (1 out of 5 produced). A 50mm block filter with additional B&W KG-3 tiltable and a M.Pieper 3 x telecentric according to mil. Standards, 20 m parallel beam path !!! 50-50 System Complete.JPG Etalon 50-01.JPG Etalon ...
- Thu Apr 02, 2020 5:34 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: My W. Lille Components
- Replies: 10
- Views: 5134
My W. Lille Components
As promised, I now present my W. Lille components to you. First the Lille BF 30 can be tilted, here with a short diagonal from Baader and an additional BG 38 can be tilted (30mm).all adaptered with T-2. Manufacturer is Solarscope / Isle of Man, UK. BF30 Complete-01.JPG BF30 Complete-02.JPG BF30 Comp...
- Wed Apr 01, 2020 11:35 am
- Forum: This is SolarChat !!
- Topic: just a little walk on the sun
- Replies: 17
- Views: 4879
Re: just a little walk on the sun
Hello Paul,
Alexandra found the right words, I can only agree with that.
sunny Greetings
Achim
Alexandra found the right words, I can only agree with that.
sunny Greetings
Achim
- Wed Apr 01, 2020 6:01 am
- Forum: This is SolarChat !!
- Topic: March 31, solar refractor 228: ha/wl/calcium
- Replies: 13
- Views: 4401
Re: March 31, solar refractor 228: ha/wl/calcium
Wouw Ale,
Nice big Scope....Wonderul Pictures, especially Ca.
sunny Greetings
Acchim
Nice big Scope....Wonderul Pictures, especially Ca.
sunny Greetings
Acchim
- Wed Apr 01, 2020 5:15 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: SolarMax 3 BF Questions (Help)
- Replies: 16
- Views: 6930
Re: SolarMax 3 BF Questions (Help)
James,
I think and i know, that the BF 5 only used in a PST, W. Lille said the same.
White Light Filter before a H-Alpha Scope ?
sunny Greetings
Achim
I think and i know, that the BF 5 only used in a PST, W. Lille said the same.
White Light Filter before a H-Alpha Scope ?
sunny Greetings
Achim
- Tue Mar 31, 2020 4:37 pm
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor ?
Yeah ... it's going ahead, faster than expected. Peter Deuster, metal processing, Cologne, Widdersdorfer Str. 215 now makes me all 3 missing adapters by Friday noon, including PST etalon internal thread M 50x1 ...... insane, this adapter is nowhere to be bought. Furthermore I have to widen my mauell...
- Tue Mar 31, 2020 6:18 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: SolarMax 3 BF Questions (Help)
- Replies: 16
- Views: 6930
Re: SolarMax 3 BF Questions (Help)
Yesterday I spoke with Wolfgang Lille about the Coronado BF blockingfilters . Only the PST 5mm block filter is a pure block filter !!! From the BF15, BF 18 and BF30 all are glued with a prefilter ala a BG38 !!! Dreadful......horrible sunny Greetings Achim Sorry, I made a mistake. Only the Coronado P...
- Tue Mar 31, 2020 3:33 am
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
Hello Valery, Thank you for your detailed explanation. I still don't know exactly how the new D-ERF series from Baader behaves. As I said, my test took place in 2015 I know the NEW Baader and ARIES D-ERFs, but I have never used one or observed it. I hope that in the near future I will have the oppor...
- Tue Mar 31, 2020 3:18 am
- Forum: This is SolarChat !!
- Topic: 3-30-2020 Observations
- Replies: 14
- Views: 4417
Re: 3-30-2020 Observations
Dear James and Mark,
I hope so too.....
sunny Greetings
Achim
I hope so too.....
sunny Greetings
Achim
- Tue Mar 31, 2020 3:14 am
- Forum: This is SolarChat !!
- Topic: 5/9 disk from 30-03-2020
- Replies: 7
- Views: 3825
Re: 5/9 disk from 30-03-2020
Dear Rainer,
Very nice representation of the H-Alpha sun.
I discovered the area here ..and i will observe it today.
https://www.spaceweather.com/
sunny Greetings
Achim
Very nice representation of the H-Alpha sun.
I discovered the area here ..and i will observe it today.
https://www.spaceweather.com/
sunny Greetings
Achim
- Tue Mar 31, 2020 3:08 am
- Forum: This is SolarChat !!
- Topic: New Sunspot 31/03/2020
- Replies: 8
- Views: 3770
Re: New Sunspot 31/03/2020
Hello Martin,
It's wonderful that you this new area of activity are shown here.
I have already seen it on "GONG" and will try to watch it today.
sunny Greetings
Achim
It's wonderful that you this new area of activity are shown here.
I have already seen it on "GONG" and will try to watch it today.
sunny Greetings
Achim
- Mon Mar 30, 2020 9:47 am
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor ?
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. A...
- Mon Mar 30, 2020 6:32 am
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
Dear James, Thank you for the good wishes. :D I am and stay healthy. The nice Lord wants me to watch H-Alpha with my 120mm Bino in the future with two eyes. You and all SolarChat users also stay healthy and alert. :movie There is only one corona ..... the solar corona. This Picture is taken at 29.03...
- Mon Mar 30, 2020 5:40 am
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
James,
Yes, this in a C-ERF, also the internal ERFs in the Lunts.
I will sent you a PN, because I cannot write a public comment here in the forum.
Achim
Yes, this in a C-ERF, also the internal ERFs in the Lunts.
I will sent you a PN, because I cannot write a public comment here in the forum.
Achim
- Sun Mar 29, 2020 11:22 pm
- Forum: Solar Scope Modifications
- Topic: H-Alpha Double-Refractor 120 / 135 / 150mm Aperture ?
- Replies: 43
- Views: 24378
Re: H-Alpha Double-Refractor ?
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 .....
- Sun Mar 29, 2020 10:56 pm
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
Hello Eric, I am 62 Years old..and an Oldtimer too..... :D Hello James, The C-ERF energy protection filters reflect bluish and dark red. When looking through it, a deep dark red sun disc appears. They were the first energy protection filters for H-Alpha ..... but probably too expensive to manufactur...
- Sun Mar 29, 2020 3:38 pm
- Forum: This is SolarChat !!
- Topic: Viually Observing the Sun......
- Replies: 29
- Views: 8743
Re: Viually Observing the Sun......
Why am I asking for visual telescopes / observers here ? Because I have found in the 10 years of H-Alpha observation that a video camera sees much more than the human eye ... as you know yourself. But now the spirits are divided. A H-Alphascope with which you can record video is by no means a good H...
- Sun Mar 29, 2020 4:25 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: W. Lille Components observing the Sun in H-Alpha
- Replies: 1
- Views: 3130
Re: W. Lille Components observing the Sun in H-Alpha
Yes, that's exactly what he did because the very good internal Solarscope etalons are sold out and nowadays they only produce frontetalons.
He used lunt etalons for internal solutions.
He used lunt etalons for internal solutions.