SolarChat!

Wah

Splendid ! Do you have higher resolution versions visible somewhere ? Of interest is the "dark void" visible north of the solar disk. It is not clear from your animation whether is it going away from the Sun, or to the Sun. Can you confirm this ? It was falling back to the sun which was n...

Wah

Splendid ! Do you have higher resolution versions visible somewhere ? Of interest is the "dark void" visible north of the solar disk. It is not clear from your animation whether is it going away from the Sun, or to the Sun. Can you confirm this ? It was falling back to the sun which was n...

Wah

Wah, can you explain a little more how you did the multi coloured one, what do the colours represent and how were they determined? Alexandra Thank you for your reply! The RGB colors were from 3 sets of images with 0, 45 and 90 degree polarization angles. Since the quality of those polarized images ...

Wah

Wah, can you explain a little more how you did the multi coloured one, what do the colours represent and how were they determined? Alexandra Thank you for your reply! The RGB colors were from 3 sets of images with 0, 45 and 90 degree polarization angles. Since the quality of those polarized images ...

Wah

Hi everyone, TSE2024 was my 4th attempt and the 2nd successful total solar eclipse. I am happy that the sky was clear enough for me to see and take photos. Attached are some pictures I have processed, and more in my Facebook posts: https://www.facebook.com/profile.php?id=100009437220266 You may also...

Wah

Hi everyone, TSE2024 was my 4th attempt and the 2nd successful total solar eclipse. I am happy that the sky was clear enough for me to see and take photos. Attached are some pictures I have processed, and more in my Facebook posts: https://www.facebook.com/profile.php?id=100009437220266 You may also...

Wah

I want to buy the etalon, thanks!

Wah

20200613 CaK Sun

Wah

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.

Wah

Turned the eq mount by hand and tried to speed up the scan and got an alien shape sun.

Wah

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).

Wah

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.

Wah

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.

Wah

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...

Wah

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.

Wah

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...

Wah

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...

Wah

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.

Wah

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?

Wah

Is there a line number or which function causes the error?

Wah

Excellent and sharp images!
How do you manage to tune the focus of the telescope, I wonder?

Wah

Excellent and sharp images!
How do you manage to tune the focus of the telescope, I wonder?

Wah

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

Hi Merlin, are you able to download the file from the above link?

Wah

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...

Wah

I am not sure about the bandwidth, what do you think based on the image below?

: 101527868_2672510259740189_3491876435340034048_o.jpg (21.75 KiB) Viewed 1448 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 (234.23 KiB) Viewed 1450 times

Wah

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.

Wah

Not from OVIO, but tailor-made from China some years ago.

Wah

Two improvements:
1. Slit fixing method
2. Print direction

: 111.jpg (104.58 KiB) Viewed 3503 times

Wah

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.

Wah

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?

Wah

The refill filament has arrived and more parts have been printed out.

Wah

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

Wah

You may compress and upload the file to google drive or dropbox and let me have a try.

Wah

This is a quick first light in the morning before going to work.

Wah

What error did it show? Or it never prompt error when the file is over 3GB?

Wah

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).

Wah

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.

Wah

Wah

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...

Wah

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!

Wah

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

Do you have more information about the equipment? Thanks!

Wah

I can see the Ha line!
Just kidding

Wah

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 ...

Wah

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...

Wah

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

Wah

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.

Wah

The camera ASI174MM theoretically can have 128fps, but I just could get about 100fps because of drop frames.

Wah

Captured it without moving, at my home!!!!!!!
What a good luck I have~~~!

Wah

: TotalSolarEclipse_ASI071MC-Cool_20170821_Stacked2.jpg (401.25 KiB) Viewed 11733 times

Wah

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 ...

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