14Nov - AR2781/2 in CAK & HA (Single frame CAK Image added on 18 Nov)

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14Nov - AR2781/2 in CAK & HA (Single frame CAK Image added on 18 Nov)

Post by yltansg »

14Nov20. Cloudy and average seeing. The Setup:

Image

ARIES D-ERF mounted on Celestron C11 fitted with Chroma CAK filters in Skybender, x2.5 Televue Powermate and ASI174MM camera.

Saw 2 micro flares on outgoing AR2781

Image

The image was formed by stacking 25 frames selected from a 1,000 frame recording. Shutter was set at 1.961ms and Gain=222. Level increased slight contrast adjustment was done in PS. No denoising or any sharpening.

Do a right click to see the image in its full resolution.

Alfred
Last edited by yltansg on Wed Nov 18, 2020 12:48 pm, edited 10 times in total.


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Re: 14Nov - AR2781 in CAK

Post by dhkaiser »

Awesome details.


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Re: 14Nov - AR2781 in CAK

Post by Carbon60 »

Nice image, Alfred. Lovely Ca II K.

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Re: 14Nov - AR2781 in CAK

Post by LTHB »

Very nice image, and great resolution! Would you mind to tell a bit more about your experience with the Chroma filters?

And one more question: Did you try some unsharp mask? (I also clearly prefer slightly soft images to oversharpened ones, but I still suspect you might get a bit more sharpness.)

Kind regards,

Frank


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Re: 14Nov - AR2781 in CAK

Post by yltansg »

LTHB wrote: Sat Nov 14, 2020 1:21 pm Very nice image, and great resolution! Would you mind to tell a bit more about your experience with the Chroma filters?

And one more question: Did you try some unsharp mask? (I also clearly prefer slightly soft images to oversharpened ones, but I still suspect you might get a bit more sharpness.)

Frank
Hi Frank,

Thanks for your kind comments.

I have tried using Daystar Calcium Quark, Lunt CAK wedge and Chroma filters. So far, the Chroma filters produced the best result. Unfortunately, I am beset by poor weather. I hope to do better with better weather.

I prefer soft images too but may occasionally do some sharpening :)

Alfred


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Re: 14Nov - AR2781/2 in CAK

Post by yltansg »

I also managed to image AR 2782.

Image

Enjoy.

Alfred


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Re: 14Nov - AR2781/2 in CAK (New Image added)

Post by eroel »

Alfred:
Beautiful CaK images.
Very well done.
Send my best regards,
Eric.


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Re: 14Nov - AR2781/2 in CAK (New Image added)

Post by Montana »

Terrific work Alfred, you are the best!!
:bow :bow :hamster:
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Re: 14Nov - AR2781/2 in CAK (New Image added)

Post by marktownley »

There's definitely a synergy with the C11 and the 2.5xPM in CaK images which works well. These came out excellent Alfred, were you running full aperture?


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Re: 14Nov - AR2781/2 in CAK (New Image added)

Post by yltansg »

marktownley wrote: Sat Nov 14, 2020 3:52 pm There's definitely a synergy with the C11 and the 2.5xPM in CaK images which works well. These came out excellent Alfred, were you running full aperture?
Hi Mark,

After previous attempts and advice from this forum, I usually put a mask when doing CAK imaging. Frankly, this time round, after a long 2 months' break I forgot about the mask. The imaging was done earlier in the morning when the Sun is about 16 Deg above the horizone. I believe I should get better quality image if I were use the mask :) Thanks for your question.

Alfred


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Re: 14Nov - AR2781/2 in CAK & HA (New HA Image added 15 Nov)

Post by yltansg »

Here is an image taken on 12 Nov at 7:50 am using the same D-ERF and setup with a Daystar Quark Chromosphere:

Image

Please do a right click to see the image in full resolution.

Seeing was average. Again I only did a little level and contrast adjustment in photoshop. You are seeing the image without much processing.

Alfred


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Re: 14Nov - AR2781/2 in CAK & HA (New HA Image added 15 Nov)

Post by EGRAY_OBSERVATORY »

Excellent imagery Alfred.
Thanks for sharing

Terry


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Re: 14Nov - AR2781/2 in CAK & HA (New HA Image added 15 Nov)

Post by yltansg »

I did 3 video recordings before thunder and lightning came upon us.


Equipment used as same as on 14 Nov: ARIES D-ERF mounted on Celestron C11 fitted with Chroma CAK filters in Skybender, x2.5 Televue Powermate and ASI174MM camera. The camera setting: Shutter=5.742ms, Gain=222. A 9" aperture mask was used.

This is a cropped image of AR12782:

Image

Alfred


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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by marktownley »

Great additions Alfred, I like the minimal post processing approach.


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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by Martin_S »

Great results alfred. :bow


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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by DeepSolar64 »

The supergranulation is quite apparent in some of these,


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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by yltansg »

Hi Dan, Stu, Frank, Eric, Alexandra, Eric, Terry, Martin and James,

Thanks for your kind comments. The earlier investigative work on getting rid of the bright reflection (associated with the Televue x2.5 Powermate) was worth it. The C11 + skybender + Chroma CAK filters + ARIES D-ERF is a winning combination.

Alfred


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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by yltansg »

DeepSolar64 wrote: Sun Nov 15, 2020 6:34 am The supergranulation is quite apparent in some of these,
Hi James,

It is especially meaningful (getting the supergranulation cells) because I apply very little processing. I am also very glad to see the 3-D effect in the last CAK image.

Alfred


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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by DeepSolar64 »

You did well Alfred. Looks good.


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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by christian viladrich »

Very interesting Alfred !
Have you made other tests with the Alluxa 1 A Ca K filter ?


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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by ffellah »

Superb close ups, Alfred !

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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by yltansg »

Hi Christian,

Testing the Alluxa filter will be next :)

Alfred


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Re: 14Nov - AR2781/2 in CAK & HA (New Hi-Res CAK Image added on 15 Nov)

Post by yltansg »

AR12781 (in CAK wavelength) making its exit on the western limb.

Image

Please right click to see it in full resolution.

Alfred


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Re: 14Nov - AR2781/2 in CAK & HA (New 2781 CAK Image added on 16 Nov)

Post by MapleRidge »

These are all superb images Alfred...nicely done :bow

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Re: 14Nov - AR2781/2 in CAK & HA (New 2781 CAK Image added on 16 Nov)

Post by yltansg »

Hi Brian,

Thanks for your kind comments.

For those who are curious, a single frame raw capture (without any processing) looks like this:

Image

I would say the single frame capture is rather good quality and that was why I didn't have to do much post processing to get the final image.

Alfred


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Re: 14Nov - AR2781/2 in CAK & HA (Single frame CAK Image added on 18 Nov)

Post by JochenM »

Excellent work there, Alfred. That single frame by itself already looks quite sharp and detailed indeed.


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Re: 14Nov - AR2781/2 in CAK & HA (Single frame CAK Image added on 18 Nov)

Post by allhoest »

Great results Alfred.
Which Chroma filter have you use?
CS
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Re: 14Nov - AR2781/2 in CAK & HA (Single frame CAK Image added on 18 Nov)

Post by yltansg »

allhoest wrote: Wed Nov 18, 2020 10:05 pm Great results Alfred.
Which Chroma filter have you use?
CS
Alex
Dear Alex,

I bought a pair of the Chroma calcium filters ( a 1-angsttrom and a 10-anstrom filter) from Apollo. I understand that these filters are the only 2 ever made. This is how I set it up:
  • The 10-angstrom filter which rejects everything but a 98% transmission line at 393.4nm, is placed on the nose of a Skybender.
  • The 1-angstrom filter which has 94% transmission is installed in the skybender and used for tilt tuning.


Image

I will be testing Alluxa-Apollo CAK filters next.

Alfred


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