Search found 373 matches

by Wah
Mon Jan 11, 2021 7:26 am
Forum: Solar Astronomy Shop and Swap
Topic: SOLD: Etalon (Pre-Meade) and like new BF5 for $99 Each
Replies: 6
Views: 2160

Re: Etalon (Pre-Meade) and like new BF5 for $99 Each

I want to buy the etalon, thanks!
by Wah
Mon Jun 15, 2020 11:18 pm
Forum: This is SolarChat !!
Topic: 20200613 CaK Sun
Replies: 7
Views: 619

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: 5745

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: 1266

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: 1266

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: 5745

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: 5745

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: 5745

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: 5745

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: 5745

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: 5745

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" doe...
by Wah
Thu Jun 11, 2020 3:13 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 5745

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: 5745

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: 5745

Re: Coming back...

Is there a line number or which function causes the error?
by Wah
Wed Jun 10, 2020 3:22 am
Forum: SPoD Archive
Topic: New spots, new observations on june 8th
Replies: 5
Views: 690

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: Solar Radio, Magnetometry and Spectroscopy
Topic: New spots, new observations on june 8th
Replies: 7
Views: 1337

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: 5745

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: 5745

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: 1384

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 1368 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 1370 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: 1384

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: 5745

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: 5745

Re: Coming back...

Two improvements:
1. Slit fixing method
2. Print direction
111.jpg
111.jpg (104.58 KiB) Viewed 3095 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: 888

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: 888

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: 5745

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: 1015

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.
by Wah
Mon Jun 01, 2020 12:41 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 5745

Re: Coming back...

You may compress and upload the file to google drive or dropbox and let me have a try.
by Wah
Sun May 31, 2020 11:51 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Quick first light
Replies: 4
Views: 1015

Quick first light

This is a quick first light in the morning before going to work.
by Wah
Sun May 31, 2020 11:48 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 5745

Re: Coming back...

What error did it show? Or it never prompt error when the file is over 3GB?
by Wah
Sun May 31, 2020 4:17 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 5745

Re: Coming back...

Which file format and what size do you need?
As far as I remember, I was using an external library for avi format which cannot handle larger size files.
Then a newer version could handle mono-color ser files without problems (I guess).
by Wah
Fri May 29, 2020 1:13 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 42
Views: 5745

Coming back...

After a long leave, I am now redesigning the spectroscopes and creating the parts by using a 3D printer.
Some optical glass slits have been used also, I hope the overall image quality can be improved.
by Wah
Wed May 20, 2020 6:47 am
Forum: Solar Scope Modifications
Topic: Coronado PST Etalon tuning anti-slip bearing modification
Replies: 18
Views: 8688

Re: Coronado PST Etalon tuning anti-slip bearing modification

The PST uses compression tuning. The Teflon ring in the chamber is the main point of pressure. The silicone ring ( the orange foam) is designed to smash the etalon until it comes into tune. Since it never compresses evenly the silicone ring is trimmed and cut so that it applies pressure as evenly a...
by Wah
Fri May 15, 2020 3:13 am
Forum: Solar Astronomy Shop and Swap
Topic: LARGE diffraction grating 20g/mm
Replies: 0
Views: 1896

LARGE diffraction grating 20g/mm

Two pieces of LARGE diffraction grating 20g/mm, about 10x10cm, with transparent protection covers.
Not sure how to use them, I guess they are Echelle gratings.
$50/piece + shipping
Sold as is.

Thank you all!
by Wah
Thu Sep 27, 2018 3:39 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 08Aug Disk: Spectral sweep through H-alpha.
Replies: 11
Views: 5822

Re: 08Aug Disk: Spectral sweep through H-alpha.

Wow~!!! Really very high resolution images!!!!! :shock: :shock: :shock:

Do you have more information about the equipment? Thanks!
by Wah
Wed Jan 24, 2018 4:07 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Some Natural Spectroscopy!
Replies: 9
Views: 4675

Re: Some Natural Spectroscopy!

I can see the Ha line!
Just kidding :P
by Wah
Wed Dec 06, 2017 8:52 am
Forum: Great American Solar Eclipse August 21 2017
Topic: Wah!'s solar eclipse photos
Replies: 22
Views: 11234

Re: Wah!'s solar eclipse photos

Congratulation for this wonderfull set of images. They are beautifully processed. Do you have a full resolution version of this image ? https://solarchatforum.com/download/file.php?id=29184 I am working with the French Astrophysical Institute of Paris, and I would like to check some details I have ...
by Wah
Wed Dec 06, 2017 8:50 am
Forum: Great American Solar Eclipse August 21 2017
Topic: Wah!'s solar eclipse photos
Replies: 22
Views: 11234

Re: Wah!'s solar eclipse photos

Amazing what you have accomplished, Wah! Your latest result is easily as good as Druckmuller’s famous pictures. Your Photoshop technique seems related to some of the multiresolution wavelet sharpening methods available in some image processing routines. Have you tried any of these? Cheers. Peter. I...
by Wah
Wed Oct 25, 2017 6:35 pm
Forum: This is SolarChat !!
Topic: Total Solar Eclipse 2017 my final version
Replies: 13
Views: 2803

Total Solar Eclipse 2017 my final version

Based on Mr. Miloslav Druckmüller's HDR and ACHF method, I processed my images again trying to squeeze all the tiniest details from them, and finally got this final version.

Because this is a final version image, i post it here :lol:
by Wah
Wed Oct 25, 2017 6:31 pm
Forum: Great American Solar Eclipse August 21 2017
Topic: Wah!'s solar eclipse photos
Replies: 22
Views: 11234

Re: Wah!'s solar eclipse photos

Based on Mr. Miloslav Druckmüller's HDR and ACHF method, I processed my images again trying to squeeze all the tiniest details from them, and finally got this final version.
by Wah
Sun Oct 08, 2017 4:29 pm
Forum: This is SolarChat !!
Topic: ISS Solar Transit 20171007
Replies: 6
Views: 1514

Re: ISS Solar Transit 20171007

The camera ASI174MM theoretically can have 128fps, but I just could get about 100fps because of drop frames.
by Wah
Sun Oct 08, 2017 4:56 am
Forum: This is SolarChat !!
Topic: ISS Solar Transit 20171007
Replies: 6
Views: 1514

ISS Solar Transit 20171007

Captured it without moving, at my home!!!!!!!
What a good luck I have~~~!
by Wah
Tue Oct 03, 2017 4:30 pm
Forum: Great American Solar Eclipse August 21 2017
Topic: Wah!'s solar eclipse photos
Replies: 22
Views: 11234

Re: Wah!'s solar eclipse photos

TotalSolarEclipse_ASI071MC-Cool_20170821_Stacked2.jpg
TotalSolarEclipse_ASI071MC-Cool_20170821_Stacked2.jpg (401.25 KiB) Viewed 11034 times
by Wah
Mon Oct 02, 2017 3:11 pm
Forum: Great American Solar Eclipse August 21 2017
Topic: Wah!'s solar eclipse photos
Replies: 22
Views: 11234

Re: Wah!'s solar eclipse photos

Thank you all! I took my EQ mount, telescopes, laptops and cameras to the eclipse, and the cameras where following the SharpCap Python scripts I prepared to capture different exposure frames (0.001-4s) during the 2 minutes totality. After coming home, I extracted the frames from SER video file with ...
by Wah
Mon Oct 02, 2017 7:14 am
Forum: Great American Solar Eclipse August 21 2017
Topic: Wah!'s solar eclipse photos
Replies: 22
Views: 11234

Re: Wah!'s solar eclipse photos

New corona enhance method result.
by Wah
Thu Sep 28, 2017 8:29 am
Forum: Great American Solar Eclipse August 21 2017
Topic: About ACHF solar corona processing
Replies: 4
Views: 4330

Re: About ACHF solar corona processing

Steven Rosenow also got a VERY good result by his own processing technique, very close to ACHF result.
I wonder if he is in this forum?

https://www.facebook.com/photo.php?fbid ... 295&type=3
by Wah
Mon Sep 25, 2017 2:51 am
Forum: Great American Solar Eclipse August 21 2017
Topic: About ACHF solar corona processing
Replies: 4
Views: 4330

About ACHF solar corona processing

I have been searching for the best total solar eclipse images, and found that the images by ACHF (created by Prof. Miloslav Druckmuller) seem to be the best of all. Is there anyone here have tried such filter? Prof. Miloslav Druckmuller's eclipse photos: http://www.zam.fme.vutbr.cz/~druck/Eclipse/Ec...
by Wah
Thu Sep 07, 2017 10:57 pm
Forum: Great American Solar Eclipse August 21 2017
Topic: Help - How do you create these composite eclipse shots?
Replies: 17
Views: 8344

Re: Help - How do you create these composite eclipse shots?

Sorry, forgot to mention, you have to choose another image during the "apply image" action.

https://www.youtube.com/watch?v=YdDGU5idVFY
by Wah
Wed Sep 06, 2017 11:35 pm
Forum: Great American Solar Eclipse August 21 2017
Topic: Help - How do you create these composite eclipse shots?
Replies: 17
Views: 8344

Re: Help - How do you create these composite eclipse shots?

You cannot use the "difference" option in layers to finish the task. 1. Duplicate the original image as another one 2. Radial blur the original image 3. Use new image to subtract the blurred image with 128 offset (gray) 4. Copy the subtracted image to clip board 5. Restore the original ima...