Search found 3554 matches

by Merlin66
Fri Jun 12, 2020 11:00 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Don't know.....
Need to think about it.
Which grating are you using?
What's the focal length of the collimator?
by Merlin66
Fri Jun 12, 2020 2:02 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Wah,
Shouldn't be any coma...but astigmatism, probably; could also be vignetting from the pick off mirror. Remember the f ratios must match.
by Merlin66
Fri Jun 12, 2020 1:12 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Wah, Always challenging experience! I try to get the spectrograph section working first. Giving a clean, well focused H alpha line. Then work with the slit to give minimum usable gap..... Final the scope should work at the same focal ratio as the spectrograph ie f10 scope to f10 spectrograph. My "ch...
by Merlin66
Thu Jun 11, 2020 11:30 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Wha,
Thanks.
I'll try that as soon as the weather allows. I'm testing a new SHG (hence the previous out of focus result) hopefully the next results will be better.
by Merlin66
Thu Jun 11, 2020 10:36 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Phil, SLiM software developed by Wah! provides the means to convert an AVI/SER video of a spectral line to a spectroheliogram. It can correct for slant and smile and offers different extraction widths. In my experience it needs the video cropped to the line of interest (VDub) prior to using. Slim_sc...
by Merlin66
Wed Jun 10, 2020 11:06 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Wah,
Error message shows lines 1753, 2044, 3286
I've attached a copy of the error screen.
SLiM2_110620_error.JPG
SLiM2_110620_error.JPG (39.1 KiB) Viewed 215 times
ken
by Merlin66
Wed Jun 10, 2020 10:20 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Wah, Unfortunately it still shows the same error messages. Looking at the "Unhandled exception" - Object reference not set to an instance of an object There seems to be references to d:\projects\SLiM_RemovedProcessing\form1.cs. I assume this was your working directory???? Let me know how I can assis...
by Merlin66
Wed Jun 10, 2020 9:42 pm
Forum: This is SolarChat !!
Topic: Tuesday 9th June 2020 CALCIUM-K images
Replies: 20
Views: 234

Re: Tuesday 9th June 2020 CALCIUM-K images

Terry,
I'd be interested to hear your results with the front AR window removed. (I've tried this previously)
The sensor cover plate cannot be removed from the chip. The thickness of this cover and the design of the chip contribute to the Newton Rings.
by Merlin66
Wed Jun 10, 2020 6:57 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Wah,
Downloaded OK
I'll try it ASAP and give you feedback.
Many thanks,
ken
by Merlin66
Wed Jun 10, 2020 4:44 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

I’m in transit....I’ll download later when I get home.
Many thanks.
by Merlin66
Wed Jun 10, 2020 12:57 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Wha,
Thanks for the feedback.
Your continued support for the SHG is appreciated.
Look forward to trying the new version.
by Merlin66
Wed Jun 10, 2020 12:18 am
Forum: This is SolarChat !!
Topic: Tuesday 9th June 2020 CALCIUM-K images
Replies: 20
Views: 234

Re: Tuesday 9th June 2020 CALCIUM-K images

The front camera windows are usually AR coated nowadays. My ASI 174 and ASI 1600 are both AR coated.
The window to to far from the sensor chip to cause NR. These are generated by interference between the sensor cover plate and the chip itself.
by Merlin66
Tue Jun 09, 2020 2:08 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 630

Re: Coming back...

Wah,
I've sent you an email with the SLiM errors, and sent a copy of the AVI file (930Mb) to dropbox
https://www.dropbox.com/s/rrjtee31vwf1h ... p.avi?dl=0
Ken
by Merlin66
Mon Jun 08, 2020 1:57 am
Forum: This is SolarChat !!
Topic: AR 2765 and the long filament - June 7, 2020
Replies: 26
Views: 355

Re: AR 2765 and the long filament - June 7, 2020

Franco,
Great result, excellent presentation.
If that's "below average seeing" just wait to you visit over here in the Bellarine....I'll show you BELOW average seeing.
Well done.
by Merlin66
Mon Jun 08, 2020 1:57 am
Forum: SPoD Archive
Topic: AR 2765 and the long filament - June 7, 2020
Replies: 19
Views: 65

Re: AR 2765 and the long filament - June 7, 2020

Franco,
Great result, excellent presentation.
If that's "below average seeing" just wait to you visit over here in the Bellarine....I'll show you BELOW average seeing.
Well done.
by Merlin66
Mon Jun 08, 2020 1:53 am
Forum: This is SolarChat !!
Topic: June 7, 2020
Replies: 10
Views: 126

Re: June 7, 2020

Bob,
Great image, well done.
Is that a 178 colour camera?
by Merlin66
Mon Jun 08, 2020 1:48 am
Forum: This is SolarChat !!
Topic: ASI ZWO 1600MM vs ASI ZWO 1600MM Pro
Replies: 13
Views: 248

Re: ASI ZWO 1600MM vs ASI ZWO 1600MM Pro

Hmmm I have the ASI 174MM, the ASI 1600MM and the ASI 1600MM-C The ASI 174 is OK, but the pixel size (5.86 micron) make it more suitable for long focal lengths - the ASI 1600 (3.6 micron pixel) I find more versatile in my gear (and give full disk options). There's no significant difference between t...
by Merlin66
Mon Jun 08, 2020 1:40 am
Forum: This is SolarChat !!
Topic: First WL C90
Replies: 17
Views: 184

Re: First WL C90

Very nice!
Question: What's the darker "thumb print" at 7 o'clock to the sunspot??
by Merlin66
Thu Jun 04, 2020 7:45 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Solar spectrum help required, please
Replies: 14
Views: 346

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: 14
Views: 346

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 9 times
by Merlin66
Wed Jun 03, 2020 9:33 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Solar spectrum help required, please
Replies: 14
Views: 346

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 2 times
by Merlin66
Wed Jun 03, 2020 10:45 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Solar spectrum help required, please
Replies: 14
Views: 346

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: 251

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: 14
Views: 346

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: 630

Re: Coming back...

Wah,
""
Some optical glass slits have been used
""
The OVIO reflective slit plates????