Search found 372 matches

by Wah
Mon Jun 15, 2020 11:18 pm
Forum: This is SolarChat !!
Topic: 20200613 CaK Sun
Replies: 7
Views: 320

20200613 CaK Sun

20200613 CaK Sun
by Wah
Mon Jun 15, 2020 7:42 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

I just barely recall that I had a mask on the lens long ago and then being removed later.
I think I will try to add a mask back and see if the image quality improves.
by Wah
Sat Jun 13, 2020 2:15 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20200613 H-beta Sun
Replies: 5
Views: 474

Re: 20200613 H-beta Sun

Turned the eq mount by hand and tried to speed up the scan and got an alien shape sun.
by Wah
Sat Jun 13, 2020 10:03 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 20200613 H-beta Sun
Replies: 5
Views: 474

20200613 H-beta Sun

Added some black stickers inside the new SHG tube and stray light blocker on the lens, I can capture the image of the sun today.
The result seems acceptable, although the scanning speed is still very natural and low (0x).
by Wah
Fri Jun 12, 2020 11:57 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

I just captured the pinhole image, and now suspect that the aberrations are from the cheap lens.
The previous good image could be due to part of the lens being blocked by the original tube and reduced some aberration.
by Wah
Fri Jun 12, 2020 11:42 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

Both the grating and collimator are old parts that once did create good image quality.
I think I will try to rotate the collimator and check again.
by Wah
Fri Jun 12, 2020 10:51 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

I replaced the slit with a pinhole last night, and checked the 0 order image.
There was some blur on the edge, while some red in the vertical direction and some green in the horizontal direction.
I tried to tilt the lens but no big help. Now I have no idea how to solve the problem...
by Wah
Fri Jun 12, 2020 1:46 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

Because my SHG is based on Littrow design, it can easily introduce some coma + astigmatism aberration.
The slit I am using is fixed-width glass slit, I think I need to remove it first and replace the grating to a mirror to check the problem.
by Wah
Thu Jun 11, 2020 11:39 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

I am struggling to tune my SHG back for better image quality but the results are still disappointing.
I think I have to disassemble it and check each element to make sure they are all in good condition...
by Wah
Thu Jun 11, 2020 11:07 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

I've forgotten the "Horizontal mode" checkbox myself, it seems still work without the tick. It is suggested to use SER format rather than AVI because it seems won't crash for larger/wider videos and also support 16bit per pixel which has higher dynamic range. It seems the "o" doesn't show correctly ...
by Wah
Thu Jun 11, 2020 3:13 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

I can process the video after converting and rotating the AVI to SER.
I only program to process horizontal lines, so you need to capture the lines horizontally.
by Wah
Thu Jun 11, 2020 3:04 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

Merlin66 wrote:
Tue Jun 09, 2020 2:08 am
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
I just downloaded this file, it is "AVI" format.
Can you try mono "SER" instead?
by Wah
Wed Jun 10, 2020 10:53 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

Is there a line number or which function causes the error?
by Wah
Wed Jun 10, 2020 3:22 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: New spots, new observations on june 8th
Replies: 7
Views: 440

Re: New spots, new observations on june 8th

Excellent and sharp images!
How do you manage to tune the focus of the telescope, I wonder?
by Wah
Wed Jun 10, 2020 3:22 am
Forum: SPoD Archive
Topic: New spots, new observations on june 8th
Replies: 5
Views: 269

Re: New spots, new observations on june 8th

Excellent and sharp images!
How do you manage to tune the focus of the telescope, I wonder?
by Wah
Wed Jun 10, 2020 1:51 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

https://drive.google.com/file/d/1Gnfkx2 ... sp=sharing

Hi Merlin, are you able to download the file from the above link?
by Wah
Wed Jun 10, 2020 12:45 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

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/rrjtee31vwf1hbp/Sun_110135_pipp.avi?dl=0 Ken I just experienced the error myself this morning, and found that it should be a setting problem. I mistakenly set the project a...
by Wah
Fri Jun 05, 2020 2:54 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: My smallest spectroscope first light
Replies: 6
Views: 501

Re: My smallest spectroscope first light

I am not sure about the bandwidth, what do you think based on the image below?
101527868_2672510259740189_3491876435340034048_o.jpg
101527868_2672510259740189_3491876435340034048_o.jpg (21.75 KiB) Viewed 485 times

BTW, I've found that my eq-mount was vibrating during the scan, it is another important factor making the image blur.
QQ图片20200605105213.png
QQ图片20200605105213.png (234.23 KiB) Viewed 487 times
by Wah
Fri Jun 05, 2020 12:48 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: My smallest spectroscope first light
Replies: 6
Views: 501

My smallest spectroscope first light

I got up early in the morning for the Venus ring, but failed.
So I changed the equipment to my smallest spectroscope (combined with Vixen 80ED as an SHG) for the first light.
Although I think the focus was not at the best position, I am still quite pleased with the results.
by Wah
Wed Jun 03, 2020 12:49 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

Not from OVIO, but tailor-made from China some years ago.
by Wah
Tue Jun 02, 2020 10:55 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

Two improvements:
1. Slit fixing method
2. Print direction
111.jpg
111.jpg (104.58 KiB) Viewed 972 times
by Wah
Tue Jun 02, 2020 10:54 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Who is going to capture the flash spectrum of the upcoming annular eclipse?
Replies: 2
Views: 276

Re: Who is going to capture the flash spectrum of the upcoming annular eclipse?

I can't go anywhere and only can see a partial eclipse at home.
Just wonder if any group members can reach the center line.
by Wah
Tue Jun 02, 2020 9:20 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Who is going to capture the flash spectrum of the upcoming annular eclipse?
Replies: 2
Views: 276

Who is going to capture the flash spectrum of the upcoming annular eclipse?

I know the coronavirus has shut down the traffic worldwide.
But I still wonder who is going to capture the flash spectrum of the upcoming annular eclipse? :roll: :roll: :roll:
by Wah
Mon Jun 01, 2020 11:40 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 1904

Re: Coming back...

The refill filament has arrived and more parts have been printed out.
by Wah
Mon Jun 01, 2020 11:38 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Quick first light
Replies: 4
Views: 334

Re: Quick first light

Yes, this is from a new all-in-one SHG, with longer focal length than before. Hope it can give better spectral resolution.