AR2741 on 14May (New image 22 May)

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yltansg
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AR2741 on 14May (New image 22 May)

Post by yltansg » Sat May 18, 2019 2:17 pm

Clouds interrupted the imaging session several times on 14 May 19. That didn't prevent me from getting some video recording with this carbon fibre C8.

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Last edited by yltansg on Wed May 22, 2019 11:44 am, edited 2 times in total.

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Re: AR2741 on 14May

Post by ffellah » Sat May 18, 2019 2:21 pm

These are fantastic, Alfred ! Great resolution and processing.

Franco :bow

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Re: AR2741 on 14May

Post by Valery » Sat May 18, 2019 2:57 pm

Very nice series of images, Alfred

IMHO, a bit too high contrast. This makes the umbra too dark and some desert areas too bright - a bit less natural than we see on a screen or visually.

But these images are really best your images in Ha. I hope that summer will please you will more good seeing days.


Valery
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Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.


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Re: AR2741 on 14May

Post by yltansg » Sun May 19, 2019 6:29 am

Thanks Franco, Valery and Pedro for your kind comments.

Valery,

I set the gamma to 2.2. I also stepped up the contrast slightly during post processing. That probably gave a very high contrast. I have re-done the image without increasing the contrast:

Image

Alfred

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Re: AR2741 on 14May

Post by marktownley » Sun May 19, 2019 7:35 am

These are excellent Alfred!

Can you describe the post processing steps you did to get this result.
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Re: AR2741 on 14May

Post by yltansg » Sun May 19, 2019 11:24 am

marktownley wrote:
Sun May 19, 2019 7:35 am
These are excellent Alfred!

Can you describe the post processing steps you did to get this result.

Thanks for asking Mark. I will be glad to share my workflow.

First, the context: The seeing was average, it rained in the earlier part of the morning and there were many fast moving clouds. The imaging session started at 9:50am and ended at 10:55am when clouds covered the skies.

I recorded 2000 to 3000 frames at 5msec, Gain@24000, Gamma@ 2.2, 12 bit, Bin1.

Step 1: I stacked between 300 frames to 800 frames, depending on the quality of the recording. The last image was a 800 frame-stack.

Step 2: ImPPG processing with settings:
Image
As mentioned by Valery, more more stacked frames will result in a less noisy image. I am still baffled by Christian's small number of frame stacking.

Step 3: Curve stretch in PS to get the desired image:

Image

Step 4: Denoise

Step 5: Level adjustment

As you can see from the above, I have done every little post processing to preserve the details as they are captured.

I am still working on my post-processing techniques to improve it further. The aim is to keep the fidelity of the captured image and bring out the details without over doing it.

I welcome comments and also am open to learning from anyone.

Alfred

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Re: AR2741 on 14May

Post by eroel » Sun May 19, 2019 6:35 pm

Alfred:
Beautiful shots, BTW, I can not still get anything near your results with a big ERF.
Still working on the dedicated scope. :(
Best wishes,
Eric.

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Re: AR2741 on 14May

Post by yltansg » Sun May 19, 2019 10:02 pm

eroel wrote:
Sun May 19, 2019 6:35 pm
Alfred:
Beautiful shots, BTW, I can not still get anything near your results with a big ERF.
Still working on the dedicated scope. :(
Best wishes,
Eric.
Hi Eric,

Which ERF is this and what scope are you using with it?

Alfred

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Re: AR2741 on 14May

Post by Valery » Mon May 20, 2019 8:08 am

Alfred, with less contrast boost the image looks more natural. Excellent!

BTW. Which PST etalon has been used? And what the Barlow lens?


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Re: AR2741 on 14May

Post by Montana » Mon May 20, 2019 9:21 am

WOW!!! these are your best yet Alfred :hamster: beautifully done and many thanks for the processing tips :bow
Alexandra

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Re: AR2741 on 14May

Post by yltansg » Mon May 20, 2019 10:26 am

Valery wrote:
Mon May 20, 2019 8:08 am
Alfred, with less contrast boost the image looks more natural. Excellent!

BTW. Which PST etalon has been used? And what the Barlow lens?


Valery
Dear Valery,

I use a Celestron 2x barlow and that fine PST etalon that I bought from you. I believe it is capable of producing even better quality image.

I put a tilt adjuster before the basler camera:

Image

I believe that brings the magnification to slightly above x2.

Alfred

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Re: AR2741 on 14May

Post by yltansg » Mon May 20, 2019 10:27 am

Montana wrote:
Mon May 20, 2019 9:21 am
WOW!!! these are your best yet Alfred :hamster: beautifully done and many thanks for the processing tips :bow
Alexandra
Hi Alexandra,

Thanks for your kind compliments. I am still working on improving my post processing technique :)

Alfred

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Re: AR2741 on 14May

Post by eroel » Mon May 20, 2019 1:20 pm

Alfred:
It is a 10" f/20 TEC Maksutov, as also a 12" f/10 Meade SCT, both with very good optics.
The ERF is an Aries.
Regards,
Eric.

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Re: AR2741 on 14May

Post by Valery » Mon May 20, 2019 4:27 pm

yltansg wrote:
Mon May 20, 2019 10:27 am
I am still working on improving my post processing technique :)

Alfred
Alfred,

If you do use the same Basler 1920-155 camera as I do, and the same FireCapture software, then always use gamma settings from 180 to 200 when imaging the surface details and 145 to 160 gamma when imaging near limb with intention to capture spots, spiculaes and brighter proms simultaneously. Barlow should be 2x - 2.5x.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.

Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.

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Re: AR2741 on 14May

Post by MAURITS » Mon May 20, 2019 8:03 pm

Excellent Alfred.
Regards,
Maurits

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Re: AR2741 on 14May

Post by yltansg » Tue May 21, 2019 1:53 am

Thanks Valery and Maurits.

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Re: AR2741 on 14May

Post by Carbon60 » Tue May 21, 2019 5:35 am

Excellent results, Alfred.

Stu.
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Re: AR2741 on 14May

Post by yltansg » Tue May 21, 2019 12:09 pm

Carbon60 wrote:
Tue May 21, 2019 5:35 am
Excellent results, Alfred.

Stu.
Thanks Stu. I hope to get the ARIES D-ERF for the C11 and C14 to work soon. I heard that carbon fibre SCT are not so good for high-resolution imaging. The CF C8 seems to be ok. My C11 is also CF. It will be interesting to see how it works out.

Alfred

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Re: AR2741 on 14May (New image 22 May)

Post by yltansg » Wed May 22, 2019 11:47 am

Tried another form of post-processing. Do you like this better?

Image

I have changed the processing to see more of the light bridge in the umbra. There is a trade-off, lesser contrast. Is this image to your liking?

Please do a right click to see the full resolution image

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Re: AR2741 on 14May (New image 22 May)

Post by ffellah » Wed May 22, 2019 3:27 pm

Hi Alfred: it is a different way of doing it, but I like it a lot. A softer processing, still maintains a lot of detail.

Franco

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Re: AR2741 on 14May (New image 22 May)

Post by marktownley » Wed May 22, 2019 8:13 pm

I prefer the last one Alfred!
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Re: AR2741 on 14May (New image 22 May)

Post by MapleRidge » Sat May 25, 2019 11:13 pm

All the images are excellent Alfred, and the last is especially sharp.

Well done :bow

Brian
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Re: AR2741 on 14May (New image 22 May)

Post by Carbon60 » Sun May 26, 2019 9:51 am

Lovely images, Alfred, especially the last one. Nice finely resolved details.

Stu.
Lunt LS60THa B1200 PTFT
150mm H-alpha Solar telescope with Lunt35 mod
DMK41, Basler acA1920-155
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Re: AR2741 on 14May (New image 22 May)

Post by yltansg » Sun May 26, 2019 10:18 am

Thanks Franco, Mark, Brian and Stu for your feedback.

Altogether I posted 6 images:

1. The first lot of 4 were formed using 300 frame-stacked images and I applied dark levels and contrast quite excessively resulting in an umbra that lost some of the light bridges
2. The 5th image was the result of a 800 frame-stacked image and with lesser dark level and lesser contrast - the result was a less contrasty image but more details in the umbra were unveiled.
3. The 6th image was the result of a 1250 frame-stack, also with lesser dark level and lesser contrast - the image was less noisy and I was able to apply more deconvolution. Brian finds this image especially sharp and Stu also like this best.

Recently I have stacked more frames to be able to do more deconvolution with ImPPG and get less noisy image. I am still puzzled by how Christian is able to get very clean image with less than 10 frame stacking. Can Christian share shed some light on it?

Alfred

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