Testing a Calcium corrector on a C11 (New image added 26Dec)

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Testing a Calcium corrector on a C11 (New image added 26Dec)

Post by yltansg »

22 Dec - The seeing condition is typical of the tropical year-end weather. I took some video using the C11 fitted with ARIES tri-band D-ERF, a 10" mask plus Chroma filters in a skybender. The setup:

Image

In a 1 hour window which featured thin clouds, I had some images on AR12794:

Image

Image

and a survey of the surrounding:

Image

Image

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

Take care.

Alfred
Last edited by yltansg on Sat Dec 26, 2020 10:06 am, edited 3 times in total.


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Re: AR 2794 in CAK

Post by ffellah »

Excellent work, Alfred !

Franco


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Re: AR 2794 in CAK

Post by EGRAY_OBSERVATORY »

Excellent Solar images Alfred and the ultra-large image of your scope & skies - tells the rest.

Thanks vm
Terry


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by yltansg »

Thanks Franco and James.

I am testing a calcium corrector from Apollo. Initial test results showed that it is a promising product.

Previously I have done quite a number of tests to get the Televue x2.5 powermate to work with the C11 for CAK imaging. And now I am getting rid of the Teleview x2.5 PM by replacing it with a calcium corrector. The corrector gives about x2.25 magnification and sharper images.

The corrector lens replaces the Televue x2.5 PM at the front of the skybender:

Image

Unfortunately, the seeing is poor at this time of the year making it not so ideal for testing the corrector. I managed to get some more images today and will be posting them later after post processing.


Alfred


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by Montana »

Very interesting Alfred, I can't wait to see more of your results :hamster: :hamster: :hamster:

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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by yltansg »

Montana wrote: Wed Dec 23, 2020 7:11 am Very interesting Alfred, I can't wait to see more of your results :hamster: :hamster: :hamster:

Alexandra
Dear Alexandra,

These 2 images were taken this morning (23 Dec at 9am local time) in average/poor seeing condition. I could see the boiling action in the video. However, it turned out ok. I am quite happy with the calcium corrector bringing out much better results from the C11 SCT:

Image

Image

Please do a right click and click on the "+" to see the image in its full resolution. As usual, I have applied minimum processing.

I believe I should be able to get even better results in good seeing condition.

Alfred


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by JochenM »

Results look very impressive considering the conditions, Alfred.

I'm unfamiliar with that Apollo corrector, sounds interesting though. Do you happen to have a link to the manufacturer website or so (couldn't find anything though a quick Google search)?


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by Montana »

oooh I would love one, if I could get an image like the last one I would be dancing all round the garden :hamster: was that full aperture or still stopped down?

Alexandra


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by yltansg »

Dear Alexandra,

I was equally surprised when I first saw the video using the calcium corrector on Firecapture. It looked sharper. I was so afraid that the clouds would cover the Sun that I kept recording and forgot to remove the mask, something I wanted to do. It was stopped down.

Alfred


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by yltansg »

JochenM wrote: Wed Dec 23, 2020 10:49 am Results look very impressive considering the conditions, Alfred.

I'm unfamiliar with that Apollo corrector, sounds interesting though. Do you happen to have a link to the manufacturer website or so (couldn't find anything though a quick Google search)?
Hi Jochen,

It is a new product, designed and fabricated by Apollo. I am not sure if he has put it up for sale. I have requested him to provide more information on it. Will share it with you when I receive it.

Cheers.

Alfred


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by Valery »

To be strict, such a device can’t be a true corrector. True corrector is not a kind of a cheep Barlow lens with a build in some negative (to SCT) spherical aberration - too many factors out of control. As soon as I will back home after Covid 19, I will post images in CaK with a true ccorrector.

Regards,

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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by yltansg »

Valery wrote: Wed Dec 23, 2020 3:00 pm To be strict, such a device can’t be a true corrector. True corrector is not a kind of a cheep Barlow lens with a build in some negative (to SCT) spherical aberration - too many factors out of control. As soon as I will back home after Covid 19, I will post images in CaK with a true ccorrector.

Regards,

Valery
Hi Valery,

Thanks in advance. I look forward to seeing your images and corrector.


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by marktownley »

This is a lovely set of images Alfred. I'm glad Apollos sct corrector is working well, it certainly seems to me that seeing is your limiting factor here. The last image is a stunner, the penumbral fibrils are starting to resolve nicely. Thank you and keep the images coming!


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by Martin_S »

Wow , that's amazing close up Cak Alfred, thanks for a great informative post.

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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK

Post by yltansg »

Thank you, Mark and Martin for your kind comments.

I also took several movies of the areas surrounding AR12794. Here is one of them:

Image

Alfred


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK (New image added 24Dec)

Post by MapleRidge »

These CaK images are fantastic Alfred...well done :bow

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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK (New image added 24Dec)

Post by yltansg »

MapleRidge wrote: Thu Dec 24, 2020 8:28 pm These CaK images are fantastic Alfred...well done :bow

Brian
Thanks Brian. I usually do very light processing. For a change, I have tried sharpening and increasing the contrast more. Please give me your feedback on which one you prefer, this one or the one posted previously. Thanks.

Image

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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK (New image added 24Dec)

Post by yltansg »

justapictureposter wrote: Sat Dec 26, 2020 12:06 am
calcium processing is unique to each user i have noticed. i gave your image a try if you do not mind.
alfred.jpg
[/quote]

Thanks. Looks nicer.

Alfred


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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK (New image added 24Dec)

Post by Carbon60 »

Looking very impressive, Alfred. I can't wait to see what you can do under more ideal conditions. I'm also looking forward to what Valery can offer.

For me the seeing conditions are almost always the limiting factor.

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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK (New image added 24Dec)

Post by Montana »

I like the first version :) I just wish it were mine :)

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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK (New image added 24Dec)

Post by yltansg »

Thanks Alexandra and Stuart.

So far the Chroma filters have produced ok results with the Televue x2.5 powermate. The first 2 sets of tests (on 22 and 23 Dec, both in poor/average seeing) with the calcium corrector (which replaced the TM x2.5 PM) look promising.

I will be doing some more tests using the corrector and Chroma filters. Then, later on, I hope to test the corrector in the following configuration:

Image

Basically the 1nm Chroma filter will be in front of the corrector and the 1 angstrom Chroma filter will be in a skybender. It will be followed by the stacked Alluxa filters (giving this Alluxa stack a half an angstrom fwhm bandwidth), each with a 75% transmission. It would be interesting to see the images coming from this configuration.

Alfred


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Re: Testing a Calcium corrector on a C11 (New image added 26Dec)

Post by yltansg »

While many of our friends have snow, we have lots and lots of clouds and rain.

Image

By the way, the lines are birds flying before the rain started pouring.

Image

I will be looking out for Windows of opportunity :)

Wishing you and your loved ones a happy year-end break.

Take care.

Alfred
Last edited by yltansg on Sat Dec 26, 2020 2:12 pm, edited 2 times in total.


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Re: Testing a Calcium corrector on a C11 (New image added 26Dec)

Post by MapleRidge »

Hi Alfred...

My first impression was that I preferred the first version, but it is rather dark and after downloading both and adjusting the brightness I think the second is a but better. Just my opinion ;)

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Re: Testing a Calcium corrector on a C11 and AR 2794 in CAK (New image added 24Dec)

Post by yltansg »

justapictureposter wrote: Sat Dec 26, 2020 12:06 am


Alfred
[/quote]

Very nice, all the little dark patches you captured are "spicule islands".

calcium processing is unique to each user i have noticed. i gave your image a try if you do not mind.
alfred.jpg
[/quote]

Dear Apollo,

Can you share with us what you did to further improve my image?

Alfred


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