Search found 3134 matches

by Merlin66
Mon Sep 17, 2018 3:24 am
Forum: This is SolarChat !!
Topic: Surface contrast in CaK for various filter bandpasses.
Replies: 18
Views: 349

Re: Surface contrast in CaK for various filter bandpasses.

Peter,
I’ve sent you an email.
Ken
by Merlin66
Sat Sep 15, 2018 11:13 pm
Forum: This is SolarChat !!
Topic: Surface contrast in CaK for various filter bandpasses.
Replies: 18
Views: 349

Re: Surface contrast in CaK for various filter bandpasses.

Eric, The digital spectroheliograph (SHG) that Peter (and others) use is not a visual spectrohelioscope (SHS) as used by Fred. Think of it as a second generation SHG making use of software to separate and re-combine the target spectral line to form a detailed image. The basic design is well within t...
by Merlin66
Sun Sep 09, 2018 10:16 pm
Forum: Solar Scope Modifications
Topic: Narrowest 393.37 ever by Apollo Lasky
Replies: 150
Views: 3670

Re: 393.4 bp0.1 - yes it does exist.

Skybender,
I think you miss-read my message...there was no intention of inferring you or the others are not capable of setting up filters.
I was suggesting, we as amateur solar observers, should have access to a capable spectrograph to allow us to confirm our own set-ups.
by Merlin66
Sun Sep 09, 2018 7:04 am
Forum: Solar Scope Modifications
Topic: Narrowest 393.37 ever by Apollo Lasky
Replies: 150
Views: 3670

Re: 393.4 bp0.1 - yes it does exist.

Guys, You are confirming my thoughts and experience with filters and etalons..... You really need to have a spectrograph to allow accurate measurement of CWL and transmission curves. I can test any filter/ filter combo with a resolution (as measured) <0.02A across the whole solar spectrum (370-8000A...
by Merlin66
Sat Sep 01, 2018 5:00 am
Forum: This is SolarChat !!
Topic: SolarMax 60 II vs, Daystar SS60-DS
Replies: 4
Views: 206

Re: SolarMax 60 II vs, Daystar SS60-DS

Pau,
The Daystar offering seems to be their Quark Chromo mounted in a 60mm f 15 refractor.
by Merlin66
Sat Sep 01, 2018 1:04 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug: Spectral sweep through the Ca K line
Replies: 13
Views: 435

Re: 08Aug: Spectral sweep through the Ca K line

Peter, As you appreciate it's always difficult to estimate the resolution from spectra comparison. A spectral reference lamp is the preferred method. Notwithstanding, I think you're pretty close in your estimates.... I ran your spectroheliograph through the SimSpec_SHG for comparison...... SimSpec S...
by Merlin66
Thu Aug 30, 2018 10:56 am
Forum: This is SolarChat !!
Topic: New camera but which one?
Replies: 32
Views: 559

Re: New camera but which one?

The T2 tilter works very well for me with the ASI 174mm.
by Merlin66
Thu Aug 30, 2018 9:52 am
Forum: This is SolarChat !!
Topic: New camera but which one?
Replies: 32
Views: 559

Re: New camera but which one?

After all the discussion, what camera were you using???
by Merlin66
Wed Aug 29, 2018 4:24 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug: Spectral sweep through the Ca K line
Replies: 13
Views: 435

Re: 08Aug: Spectral sweep through the Ca K line

Peter,
Well done mate!
What bandwidth were you using??
by Merlin66
Tue Aug 28, 2018 11:00 pm
Forum: This is SolarChat !!
Topic: New camera but which one?
Replies: 32
Views: 559

Re: New camera but which one?

DON'T buy an ASI 183mm for solar narrowband imaging. I went through the same thought analysis - using the ED80 (600mm fl) and the PST mod (>1000mm fl) and the ASI 174 I have... I did buy an ASI 183mm - and had "issues" - these were final recognised and accepted by ZWO who stated "due to technical is...
by Merlin66
Thu Aug 23, 2018 8:25 am
Forum: Solar Scope Modifications
Topic: How to double stack a Lunt CaK Module? And ERF?
Replies: 22
Views: 607

Re: How to double stack a Lunt CaK Module? And ERF?

I thought the Baader CCD-D was a good ERF for the CaK....
I need to put it on the spectrograph to see what if any the transmission is >400nm.
I’ll post the results......
by Merlin66
Sun Aug 12, 2018 8:22 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What camera do you use?
Replies: 13
Views: 478

Re: What camera do you use?

I tried the ASI 183MM with the smaller pixels and had “issues” which Was acknowledged by ZWO an not being suitable for narrowband Ha solar...they offered a refund and I replace it with the ASI 1600MM which seems to be working well for me. The ASI 178 has the same pixel size as the ASI 183MM but I ha...
by Merlin66
Sun Aug 12, 2018 3:39 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug Spectroheliograms
Replies: 10
Views: 292

Re: 08Aug Spectroheliograms

Peter,
Excellent results!!!
Well done.
by Merlin66
Sat Aug 11, 2018 10:00 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What camera do you use?
Replies: 13
Views: 478

Re: What camera do you use?

Hmmm, that's interesting.
I use the ASI 174 and find most times I get NR and need to use the Tilter. The new ASI 1600 so far has not shown any NR.....
I use FireCapture.
by Merlin66
Sat Aug 11, 2018 9:59 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What is a blocking filter function?
Replies: 3
Views: 193

Re: What is a blocking filter function?

The blocking filter is an extremely narrow band (10A) filter centred on Ha. This is mandatory with an etalon type filter to effectively "sort" the myriads of band passes obtained to just allow the one at Ha to pass through.

I think your application with the telelens may have to be re-assessed.
by Merlin66
Thu Aug 09, 2018 7:55 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What camera do you use?
Replies: 13
Views: 478

Re: What camera do you use?

Stefan,
I use an ASI 174mmfor fl above 1000mm and now testing an ASI 1600mm for shorter fl.
by Merlin66
Fri Aug 03, 2018 1:49 am
Forum: This is SolarChat !!
Topic: Solar proms in Ha 1st Aug 2018
Replies: 4
Views: 128

Re: Solar proms in Ha 1st Aug 2018

Franco,
Thanks, appreciated!
I should have said that the excellent Corono software is available here:
http://sweiller.free.fr/Softwares/Corono/corono.html
by Merlin66
Fri Aug 03, 2018 1:28 am
Forum: This is SolarChat !!
Topic: Solar proms in Ha 1st Aug 2018
Replies: 4
Views: 128

Solar proms in Ha 1st Aug 2018

Just a quick series of shots... SM60/ ED80 with the new ASI 1600MM.
Processed in AS3! and Corono....
PSP_comp.jpg
PSP_comp.jpg (518.07 KiB) Viewed 128 times
PSP_comp_zoom.jpg
PSP_comp_zoom.jpg (122.51 KiB) Viewed 128 times
by Merlin66
Fri Jul 27, 2018 1:36 am
Forum: This is SolarChat !!
Topic: CBSAP shutting down September 1st
Replies: 28
Views: 1269

Re: CBSAP shutting down September 1st

Stephen, I can understand the reasoning about your decision and sincerely wish you all the best for your future activities. As you know the Solar Chat forum has become the best solar forum available. It allows the transfer of knowledge and data on all aspects of solar observing and is honestly "home...
by Merlin66
Tue Jul 24, 2018 11:49 pm
Forum: This is SolarChat !!
Topic: Large Filament | 150mm & Quark | 6562.8A | July 24th 2018
Replies: 12
Views: 322

Re: Large Filament | 150mm & Quark | 6562.8A | July 24th 2018

Interesting comment re the Quark...here in Australia we regularly get temperatures in the 40 deg C....
I could not get confirmation from Daystar that the quark would function in elevated temperatures......
by Merlin66
Mon Jul 16, 2018 12:32 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Even when there's little going on....
Replies: 6
Views: 420

Re: Even when there's little going on....

Once again you demonstrate the excellent capabilities of the SHG system. Well done!
by Merlin66
Sun Jul 15, 2018 6:12 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Recent Digital SHG
Replies: 12
Views: 404

Re: Recent Digital SHG

Yes, definitely a very good SGH image!!
I'd appreciate seeing an image of your set-up.......
by Merlin66
Sat Jul 14, 2018 8:15 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Recent Digital SHG
Replies: 12
Views: 404

Re: Recent Digital SHG

More detail on the SHG system, please!!!
by Merlin66
Fri Jul 13, 2018 3:14 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: NEW direction in the solar narrowband imaging.
Replies: 53
Views: 2247

Re: NEW direction in the solar narrowband imaging.

No sun, but bright cloud (!!)
The illustration below shows the SM60 etalon bands and the CaK II absorption lines.

Not good news...
The FWHM of the bands is 7A in this region...finesse 18.7A and the tilt adjustment gives 1.2A towards the blue.

Any comment/ feedback?
SM60ED80_CaK II.JPG
SM60ED80_CaK II.JPG (109.41 KiB) Viewed 273 times