Search found 3611 matches

by Merlin66
Thu Jun 04, 2020 7:45 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Solar spectrum help required, please
Replies: 15
Views: 1119

Re: Solar spectrum help required, please

Stu,
Using a 10mm grating in 2nd order is marginal. Most gratings used are 25mm or 30mm sq.
I’d recommend you try to calibrate a reference lamp to verify resolution and tune the grating rotation.
by Merlin66
Thu Jun 04, 2020 12:48 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Solar spectrum help required, please
Replies: 15
Views: 1119

Re: Solar spectrum help required, please

Stu,
Making some guesses about slit gap (20 micron) and spacing between the grating and the imaging lens (100mm), I've put your parameters into the Simspec spreadsheet.
SimSpec V4.3_Stu_solarchat.xls
(78.5 KiB) Downloaded 36 times
by Merlin66
Wed Jun 03, 2020 9:33 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Solar spectrum help required, please
Replies: 15
Views: 1119

Re: Solar spectrum help required, please

Stu,
Understood.
The SimSpec Spreadsheet will help confirm your design and the probable resolution etc. Just enter your data....
SimSpec V4_3.zip
(20.51 KiB) Downloaded 30 times
by Merlin66
Wed Jun 03, 2020 10:45 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Solar spectrum help required, please
Replies: 15
Views: 1119

Re: Solar spectrum help required, please

Stu, The collimator must match the incoming beam. This means your 50mm lens is working at f10. This will probably suit your smaller 10mm grating...It’s also usual for the imaging lens to be the same or less than the collimator focal length. Pencil sharpener blades with the bevel facing the collimato...
by Merlin66
Tue Jun 02, 2020 11:27 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Benchtop Ritchey Chretien Collimating with an astronomy imaging camera.
Replies: 9
Views: 924

Re: Benchtop Ritchey Chretien Collimating with an astronomy imaging camera.

Well done Martin!
Looks like you have a great white light set-up.
Just a note. Al's collimating tool (http://www.iceinspace.com.au/forum/show ... ool&page=2) is a very good tool to assist in collimating.
by Merlin66
Tue Jun 02, 2020 11:17 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Solar spectrum help required, please
Replies: 15
Views: 1119

Re: Solar spectrum help required, please

Stu,
What's the design of your spectrograph?
I use BASS Project (https://groups.io/g/BassSpectro) for all my spectral processing....
by Merlin66
Tue Jun 02, 2020 11:05 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 2218

Re: Coming back...

Wah,
""
Some optical glass slits have been used
""
The OVIO reflective slit plates????
by Merlin66
Mon Jun 01, 2020 1:05 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 2218

Re: Coming back...

Wah,
Give me some time to find the files.
I'll email you when I'm ready.
ken
by Merlin66
Sun May 31, 2020 11:57 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 2218

Re: Coming back...

I think it just didn't run.....
(Been a while now due to weather and other issues. I could probably find the file on the computer and check if needed.
by Merlin66
Sun May 31, 2020 11:33 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 2218

Re: Coming back...

Wah,
I've been trialling a fast frame ASI 174MM camera on the SHG, using the x2 RA speed to reduce acquisition time. ( Using an ROI just enough to get the spectral line, I can get up to 400 fps)
The SER files can be up to 3Gb in size....this seems to be an issue for SLM?
Ken
by Merlin66
Sun May 31, 2020 8:38 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 2218

Re: Coming back...

Wah,
Glad to see you back.
I think 3D printing is the way forward. Paul has been active producing his LowSpec spectroscope design, a great introduction to slit spectroscopy.
Are you going to update your SLM software to allow larger files???
by Merlin66
Sun May 31, 2020 8:31 am
Forum: This is SolarChat !!
Topic: First Light RC6 WL & Lunar testing
Replies: 17
Views: 582

Re: First Light RC6 WL & Lunar testing

Well done, Martin!
Nice to see your new set-up.
Hopefully the weather will be kind to you.
Ken
by Merlin66
Fri May 22, 2020 8:53 am
Forum: This is SolarChat !!
Topic: How to use the DS ethalon on Lunt50?
Replies: 3
Views: 243

Re: How to use the DS ethalon on Lunt50?

Taipan,
Most secondary etalon filters require some “clocking” ie rotating relative to the front of the scope to find the best alignment.
by Merlin66
Thu May 21, 2020 5:46 am
Forum: Solar Scope Modifications
Topic: Coronado PST Etalon tuning anti-slip bearing modification
Replies: 18
Views: 4563

Re: Coronado PST Etalon tuning anti-slip bearing modification

Wah,
According to the description given....yes, something like that!
I was told it definitely was not tilt tuning, or that the spacers were flexible enough to be squeezed.....
by Merlin66
Wed May 20, 2020 6:54 am
Forum: Solar Scope Modifications
Topic: Coronado PST Etalon tuning anti-slip bearing modification
Replies: 18
Views: 4563

Re: Coronado PST Etalon tuning anti-slip bearing modification

Wah,
Basically yes. The pressure/ counter pressure close to the edge seems to distort the plates to effectively increase the gap between them.
by Merlin66
Mon May 18, 2020 8:47 am
Forum: Solar Reference Library
Topic: Etalon info for beginners
Replies: 12
Views: 1036

Re: Etalon info for beginners

In my recent book “Imaging Sunlight” - Springer there’re a good chapter on the etalon function and current available solar filters.
by Merlin66
Mon May 11, 2020 6:49 am
Forum: Solar Software
Topic: Processed images cannot be resized
Replies: 3
Views: 625

Re: Processed images cannot be resized

Download Irfanview.
This allows cropping and re-sizing of many image formats.
https://www.irfanview.com/
by Merlin66
Mon May 11, 2020 6:47 am
Forum: This is SolarChat !!
Topic: Place of ITF.
Replies: 4
Views: 271

Re: Place of ITF.

As Mark says, it's not located inside the tube assembly of the telescope. It's found on the front of the blocking filter diagonal which holds the eyepiece. (There are actually two filters in a blocking diagonal - the one at the front, usually looks like a bright mirror surface, this is the ITF. The ...
by Merlin66
Mon May 11, 2020 6:37 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Personal Solar Telescope Age
Replies: 5
Views: 643

Re: Personal Solar Telescope Age

PST serial numbers don't mean much..... If the PST has a "blue" objective then it's either relatively new or has had the objective replaced (with an internal ITF added at the eyepiece holder). Unless the instrument has been dropped and the etalon damaged....there's not much else to go wrong. 99% of ...
by Merlin66
Fri May 08, 2020 8:19 am
Forum: Solar Scope Modifications
Topic: 100DS - Modified Quark using 2" 35nm ERF.
Replies: 9
Views: 971

Re: 100DS - Modified Quark using 2" 35nm ERF.

Yes, there is limited storage on the forum....
I use Dropbox as a mechanism to transfer larger files.
by Merlin66
Fri May 08, 2020 8:14 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: "Coated" Lunt BG38 Blue filter?????
Replies: 11
Views: 887

Re: "Coated" Lunt BG38 Blue filter?????

No, the Coronado ITF is a completely different design.
If it fails, the Maier Photonics replacement is a drop in replacement.
by Merlin66
Wed May 06, 2020 6:13 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: "Coated" Lunt BG38 Blue filter?????
Replies: 11
Views: 887

Re: "Coated" Lunt BG38 Blue filter?????

In a recent post he says: """ Lunt were able to tell me that the blue glass is a UV Cut filter. The newest version has a coating to inhibit this build up. They also confirmed it was OK to try and clean the old BG filter and suggested CLR. """ I'm following it up with "Anthony" the member on SGL.....
by Merlin66
Wed May 06, 2020 1:28 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: "Coated" Lunt BG38 Blue filter?????
Replies: 11
Views: 887

"Coated" Lunt BG38 Blue filter?????

https://luntsolarsystems.com/shop/solar-products/hydrogen-alpha/lunt-replacement-parts/blue-glass-for-lunt-blocking-filters/ I see there are reports, on SGL, that the replacement Lunt "Blue" filters for the BF assembly are "coated" for additional protection.. I'm unable to confirm. Does anyone have ...
by Merlin66
Fri May 01, 2020 6:29 am
Forum: This is SolarChat !!
Topic: Using different settings in Autostakkert 3
Replies: 16
Views: 1639

Re: Using different settings in Autostakkert 3

Another thought I have is that when long AVI’s are used, say 3000 frames the “best” 100 or 5% etc will be taken from the whole AVI - some may be at the beginning, some in the middle and some at the end. To me this could lead to surface, or prom movements being blurred due to movement in the detail d...
by Merlin66
Fri May 01, 2020 6:18 am
Forum: Solar Software
Topic: Solar Observing
Replies: 2
Views: 834

Re: Solar Observing

My solar telescopes, White light, H alpha and CaK are mounted on a SW HEQ5 mount. When properly polar aligned I don’t need to use any additional guiding software and generally just use sidereal tracking. This keeps the solar disk in the FOV for as long as I want. The only “additional” controls I use...