Search found 3122 matches

by Merlin66
Sun Aug 12, 2018 8:22 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: What camera do you use?
Replies: 13
Views: 304

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: 9
Views: 180

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: 304

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: 121

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: 304

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: 87

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: 87

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 87 times
PSP_comp_zoom.jpg
PSP_comp_zoom.jpg (122.51 KiB) Viewed 87 times
by Merlin66
Fri Jul 27, 2018 1:36 am
Forum: This is SolarChat !!
Topic: CBSAP shutting down September 1st
Replies: 25
Views: 869

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: 269

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: 339

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: 314

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: 314

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: 1992

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 215 times
by Merlin66
Tue Jul 10, 2018 5:39 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: NEW direction in the solar narrowband imaging.
Replies: 53
Views: 1992

Re: NEW direction in the solar narrowband imaging.

Quick update - the weather has been absolutely terrible - clouds, clouds and wind, rain...repeat.... I did manage to set up the Spectra-L200 with a 1200 l/mm grating, resolution around 0.7A and get the CaK II lines focused in the NIR. Needed a red sort filter to suppress the 2nd order spectrum. Just...
by Merlin66
Tue Jul 03, 2018 8:56 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Coronado SolarmaxII 60 problem
Replies: 6
Views: 393

Re: Coronado SolarmaxII 60 problem

I think we need feedback from current SMII users.....
by Merlin66
Tue Jul 03, 2018 6:56 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: strong prom in Ha and even in Hb
Replies: 5
Views: 295

Re: strong prom in Ha and even in Hb

John,
Very good mate!
You're doing well.
by Merlin66
Tue Jul 03, 2018 1:56 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Coronado SolarmaxII 60 problem
Replies: 6
Views: 393

Re: Coronado SolarmaxII 60 problem

Aahhh, OK, I now realise the problem!
I would have thought the retaining ring that the nylon tipped grub screw sits it would have been more robustly held in the glass plate....

I found these on my files...an early SM60 "failure" - looks like a small retaining collar?
by Merlin66
Tue Jul 03, 2018 1:49 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: NEW direction in the solar narrowband imaging.
Replies: 53
Views: 1992

Re: NEW direction in the solar narrowband imaging.

Guys, Unless you can analyse the etalon comb/ CWL's in the "new" target wavelength - it's just a guess..... I'm going to set up the spectrograph (R=10000) which should give at least 0.1A resolution and record the PST "comb" at the NIR CaII lines...if all goes well then I can try other lines...... If...
by Merlin66
Sun Jul 01, 2018 11:38 pm
Forum: Solar Scope Modifications
Topic: Baader Telecentric - Lower flux in blue/CaK?
Replies: 4
Views: 823

Re: Baader Telecentric - Lower flux in blue/CaK?

What exposure times are you comparing it to??
Which camera?
by Merlin66
Sun Jul 01, 2018 11:37 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Coronado SolarmaxII 60 problem
Replies: 6
Views: 393

Re: Coronado SolarmaxII 60 problem

Maier Photonics supply a drop in replacement for the ITF. I don't honestly know, I use an original SM60... but I'd think the central pressure screw is adjusted to give an on-band CWL (or really just to the red wing) and then given a spot of Loctite to hold it. Then by turning the turner ring the pre...
by Merlin66
Sun Jul 01, 2018 4:27 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: NEW direction in the solar narrowband imaging.
Replies: 53
Views: 1992

Re: NEW direction in the solar narrowband imaging.

Valery,
I’ll see what I can do.
An exposure of the NIR same camera, same exposure, with and without the etalon will be influenced by the etalon comb......let me think about it.
by Merlin66
Sun Jul 01, 2018 12:51 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: NEW direction in the solar narrowband imaging.
Replies: 53
Views: 1992

Re: NEW direction in the solar narrowband imaging.

Looking more closely at the Liege solar atlas, it appears we have the double CaII lines in the NIR - 8542A and 8662A.
I've done a rough calibration on the PST spectrum to show these lines.......
Liege_PST etalon_NIR_Ca II.JPG
Liege_PST etalon_NIR_Ca II.JPG (188.97 KiB) Viewed 674 times
by Merlin66
Sat Jun 30, 2018 6:48 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: NEW direction in the solar narrowband imaging.
Replies: 53
Views: 1992

Re: NEW direction in the solar narrowband imaging.

I've seen the etalon bands all the way down to the UV, but never paid attention to the NIR, I expect to see them all the way. How close is one band to the required CWL I think will be the issue. (OK, found an old spectrum of a PST etalon - low resolution and not focused for the NIR but the wavelengt...
by Merlin66
Sat Jun 30, 2018 2:57 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: NEW direction in the solar narrowband imaging.
Replies: 53
Views: 1992

Re: NEW direction in the solar narrowband imaging.

Valery,
The attached screen from BASS2000 shows both lines.....
CaII_NIR.JPG
CaII_NIR.JPG (67.41 KiB) Viewed 744 times
by Merlin66
Sat Jun 30, 2018 1:24 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: NEW direction in the solar narrowband imaging.
Replies: 53
Views: 1992

Re: NEW direction in the solar narrowband imaging.

Looking at the solar spectrum map....
There seems to be an interesting CaII line at 8498.1A as well as the large shallow CaII 8542.2A.
If I ever see the Sun again I'll see how the etalons perform out in the NIR.