Search found 3486 matches

by Merlin66
Tue Mar 31, 2020 9:58 am
Forum: This is SolarChat !!
Topic: Limb edge in CaK
Replies: 9
Views: 98

Re: Limb edge in CaK

Mark,
Your eyesight must be much better than mine.....
I can’t see a “double edge”.....
by Merlin66
Tue Mar 31, 2020 3:49 am
Forum: This is SolarChat !!
Topic: Limb edge in CaK
Replies: 9
Views: 98

Limb edge in CaK

Just a question.... We know in H alpha depending on the bandwidth, we can pick up the spiculation layer at the solar edge, and when using a wider bandwidth (with a single stack etalon) we get the "double edge" where the background Photosphere shows.... Why don't we see a similar effect when working ...
by Merlin66
Mon Mar 30, 2020 9:38 pm
Forum: Solar Scope Modifications
Topic: Coronado PST Etalon tuning anti-slip bearing modification
Replies: 14
Views: 188

Re: Coronado PST Etalon tuning anti-slip bearing modification

OK guys...here's the definitive answer on how the PST etalon is actually tuned! After almost 15 years of guessing/ discussion/ debate etc. I managed to get a reply from my contact who has worked with assembly and testing of the PST in production.... I asked the question: The options I think are: 1. ...
by Merlin66
Mon Mar 30, 2020 6:54 am
Forum: Solar Scope Modifications
Topic: Coronado PST Etalon tuning anti-slip bearing modification
Replies: 14
Views: 188

Re: Coronado PST Etalon tuning anti-slip bearing modification

The tuning range is only from about 2A above H alpha to down in the blue towards the continuum.
by Merlin66
Sun Mar 29, 2020 10:41 pm
Forum: Solar Scope Modifications
Topic: Coronado PST Etalon tuning anti-slip bearing modification
Replies: 14
Views: 188

Re: Coronado PST Etalon tuning anti-slip bearing modification

The Lunt patent on the PST is readily available...
https://patents.google.com/patent/US7149377
The attached extract when read along with Fig 13 and Fig 14 of the patent may give an insight to the tuning method.
Extract_Lunt_Patent.pdf
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Patent_Fig13.JPG
Patent_Fig13.JPG (38.3 KiB) Viewed 87 times
Patent_Fig14.JPG
Patent_Fig14.JPG (25.34 KiB) Viewed 87 times
by Merlin66
Sun Mar 29, 2020 8:49 am
Forum: Solar Scope Modifications
Topic: Coronado PST Etalon tuning anti-slip bearing modification
Replies: 14
Views: 188

Re: Coronado PST Etalon tuning anti-slip bearing modification

Ok,
The orange “washer” also has a additional small block or piece attached.....you can see it if you look at a ring.
As the tilt ring is rotated the etalon is pushed against this ring and the small block causes the etalon to tilt and change the tuning.
Basic tilt tuning of the etalon.
by Merlin66
Sun Mar 29, 2020 7:30 am
Forum: Solar Scope Modifications
Topic: Coronado PST Etalon tuning anti-slip bearing modification
Replies: 14
Views: 188

Re: Coronado PST Etalon tuning anti-slip bearing modification

Hmmm,
Mark produced “anti tilt” spacers for the PST.
To tune the PST etalon in must be allowed to tilt.....
by Merlin66
Wed Mar 25, 2020 9:08 pm
Forum: Solar Scope Modifications
Topic: Two simultaneous pst etalon
Replies: 11
Views: 1564

Re: Two simultaneous pst etalon

All's well that ends well..........
by Merlin66
Tue Mar 24, 2020 10:31 pm
Forum: Solar Scope Modifications
Topic: Two simultaneous pst etalon
Replies: 11
Views: 1564

Re: Two simultaneous pst etalon

Bart and others have previously set up double PST etalons...the circular polarizer worked...
viewtopic.php?f=4&t=26437
viewtopic.php?f=9&t=25524&p=229597&hili ... ck#p229597
viewtopic.php?f=4&t=25564
by Merlin66
Tue Mar 24, 2020 5:57 am
Forum: This is SolarChat !!
Topic: How I orient my camera ...
Replies: 17
Views: 228

Re: How to correctly orient your camera ...

Rainer,
OK.
I was assuming most of us used EQ mounts and by aligning the camera FOV to the RA and Dec axis, it ensures the Solar image has North to the top as per TiltingSun and all the references.
I agree 100% that we should set a "good" example and orientate our images correctly.....
by Merlin66
Mon Mar 23, 2020 9:29 pm
Forum: This is SolarChat !!
Topic: How I orient my camera ...
Replies: 17
Views: 228

Re: How to correctly orient your camera ...

Rainer, ""Allright but that helps only for setting up your camera orthogonal as good as possible to the moving of the RA and DEC axis but that does not mean that you will image the Sun in a correct orientation ..."" Don't understand.. The solar image in the FOV ends up orientated with North at the t...
by Merlin66
Mon Mar 23, 2020 7:30 am
Forum: This is SolarChat !!
Topic: 2020-03-22 Some CaK
Replies: 14
Views: 177

Re: 2020-03-22 Some CaK

Jochen,
Great shots!
The cloud cover may give you time to look at the dust bunnies....
I found a f20 type beam. Plastic bag objective cover and a bright sky show up those annoying dust spots.......
by Merlin66
Mon Mar 23, 2020 6:10 am
Forum: Solar Scope Modifications
Topic: Optimum BF for 6" f/10 with PST etalon and ASI174?
Replies: 35
Views: 3339

Re: Optimum BF for 6" f/10 with PST etalon and ASI174?

The Ha systems are listed and documented, but I can't see any specifics on the BF (LS1800 is mentioned), there no information on compatibility with other etalon suppliers (ie Lu,t Coronado, Solar Spectrum, SolarScope etc.)
by Merlin66
Mon Mar 23, 2020 5:54 am
Forum: This is SolarChat !!
Topic: Today's SUN (20200322) | TEC140 Ca-K polar faculae
Replies: 21
Views: 305

Re: Today's SUN (20200322) | TEC140 Ca-K polar faculae

The faculae recorded in CaK wavelengths is similar but not identical to that seen in the white light Photosphere.
by Merlin66
Mon Mar 23, 2020 5:20 am
Forum: This is SolarChat !!
Topic: Today's SUN (20200322) | TEC140 Ca-K polar faculae
Replies: 21
Views: 305

Re: Today's SUN (20200322) | TEC140 Ca-K polar faculae

Pedro,
Thanks for that mate, greatly appreciated.
You've brightened up my otherwise drab and drismal ( from my daughter- Dismal + drizzle) day.
Deepsolar64,
Any CaK detail is extremely difficult to see (some say impossible - if you're over 14 years of age...)
by Merlin66
Mon Mar 23, 2020 5:15 am
Forum: This is SolarChat !!
Topic: How I orient my camera ...
Replies: 17
Views: 228

Re: How to correctly orient your camera ...

I rely on the telescope movements to confirm the directions in the FOV. Using the SW hand controller at slew rate 2 allows the solar image to be moved N-S (confirmed earlier by actual telescope movement direction) E-W can be established by stopping the drive and watch the drift direction of of the s...
by Merlin66
Sun Mar 22, 2020 9:29 pm
Forum: This is SolarChat !!
Topic: Full disk 20-03-2020
Replies: 23
Views: 262

Re: Full disk 20-03-2020

Rainer,
OK - that was the key!
Finally got an acceptable result.....
Sun_095552grid.jpg
Sun_095552grid.jpg (156.15 KiB) Viewed 126 times
by Merlin66
Sun Mar 22, 2020 8:44 pm
Forum: This is SolarChat !!
Topic: Full disk 20-03-2020
Replies: 23
Views: 262

Re: Full disk 20-03-2020

Rainer, I can't seem to get the following to work for me: "" use the Select > Color Range tool and set it to Fuzziness 20. This will select the Grid. Copy the grid with Ctrl + C and paste it onto your 1850 sized sun."" When using the Color Range I get the "crawling ants" outlining the grid pattern.....
by Merlin66
Sun Mar 22, 2020 7:38 pm
Forum: This is SolarChat !!
Topic: Solar activity 20th March 2020
Replies: 11
Views: 221

Re: Solar activity 20th March 2020

Thanks guys!
Mark,
Sorry I should have said, yes the ED80 is masked down to 60mm for the CaK.
by Merlin66
Sun Mar 22, 2020 4:04 am
Forum: This is SolarChat !!
Topic: Full disk 21-03-2020
Replies: 6
Views: 130

Re: Full disk 21-03-2020

James et al, The "trick" I find is to orientate the camera so that you have North at the top of the image - this can be checked by slow scanning of the solar disk and watching which way it moves.... Then TiltingSun etc. will allow you to superimpose a heliocentric grid to allow measurements ...... h...
by Merlin66
Sun Mar 22, 2020 3:39 am
Forum: This is SolarChat !!
Topic: Full disk 21-03-2020
Replies: 6
Views: 130

Re: Full disk 21-03-2020

Rainer,
Very good!
Sent you a PM Re TiltingSun.....
by Merlin66
Sun Mar 22, 2020 12:24 am
Forum: This is SolarChat !!
Topic: Solar activity 20th March 2020
Replies: 11
Views: 221

Re: Solar activity 20th March 2020

Thanks everyone, appreciated!
The conditions are never perfect down here and I need to spend more time on my processing.
by Merlin66
Sat Mar 21, 2020 7:28 am
Forum: This is SolarChat !!
Topic: Solar activity 20th March 2020
Replies: 11
Views: 221

Re: Solar activity 20th March 2020

Thanks guys, appreciated.
by Merlin66
Fri Mar 20, 2020 9:44 pm
Forum: This is SolarChat !!
Topic: Solar activity 20th March 2020
Replies: 11
Views: 221

Solar activity 20th March 2020

Average seeing, cut short due to cloud.
New AR visible and the two proms (only one imaged)
DIY CaK filter on ED80/ ASI 1600
SM60DS on ED80/ ASI 1600
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