Ca K image taken with the TOA 150 on April 22nd

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christian viladrich
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Ca K image taken with the TOA 150 on April 22nd

Post by christian viladrich »

Hi,
This test image was taken with only fair resolution. There was some activity next to the sunspot :
Image
Christian


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by ffellah »

Fantastic image and resolution

Franco


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by MapleRidge »

An excellent CaK image Christian...great details :bow

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Re: Ca K image taken with the TOA 150 on April 22nd

Post by Valery »

Christian,

This image is nearly as good as the images from April 25. The seeing here, Apr 22 is almost as good for a 6" aperture as it was later Apr 25.
For larger apertures the difference will be much more significant.

And I believe that finesse of your Barr (Materion) CaK filter is much higher than any CaK filter I ever saw (images) among amateurs. And this your filter is perfectly at the center of the CaK band. Not so with other filters. This can be seen how the supergranulation cells look like at your omages and at other images.


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Last edited by Valery on Fri Apr 27, 2018 11:47 pm, edited 1 time in total.


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by marktownley »

Another brilliant image Christian.

I agree Valery about the filter being dead centre line.


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by Carbon60 »

Superb image, Christian.

Stu.


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by christian viladrich »

Thanks to all :-)


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by pedro »

Fantastic resolution Christian


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by eroel »

Christian:
Superb shot.
Best wishes,
Eric.


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by christian viladrich »

Thanks Pedro and Eric !


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by marktownley »

Hi Christian, you use the TOA very effectively here for your CaK images; are there any other scopes you have used previously that you would rate for Ca work? Thanks, Mark.


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by christian viladrich »

Hi Mark,

As you know, the problem with refractors is the spherical aberration in UV.

I have only used three refractors since I started Ca K imaging 18 years ago (time is flying ...).

- Vixen 55 mmF/8 Fluo: I started with that one.
- Taka FSQ 106 F/5 (first version ) : when I moved to the FSQ, I realized that the Vixen 55 F/8 Fluo had a huge sperical aberration in UV. When the FSQ was stopped down to 55 mm, the Ca K images were much better than with the Vixen 55 F/8 Fluo.
But ... the FSQ could not give good Ca K images at full aperture. It had to be stopped down to 80 mm or lower.
- TOA 150 : is excellent in Ca K even at full aperture. The spot diagram at 396 nm also says so ...The only limit is that the coating absorbs about 50% of the light in Ca K (for the total of the three lenses). Taka was OK to coat a lens for Ca K, but ...it meant a lot of € again.
What is nice is that a 150 nm aperture at 396 nm has the same resolution as a 250 mm aperture at 656 nm :-)

This being said... the most difficult part is to find the spherochromatism data in UV light for the various refractors available. So I am afraid I can help much :-(

I remember a post on CN describing an optical design for a refractor optimised for Ca K (two lens). This could be a way.

Another way could be to go for a 150 mm F/7 Newtonian with a coated mirror. A 50 mm Astronomik blue filter placed in front of the secondary mirror could play the role of an internal ERF. This might be the best overall option for HR Ca K imaging.


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Re: Ca K image taken with the TOA 150 on April 22nd

Post by marktownley »

Thanks Christian, that's useful info. I've tried a handful of scopes too, and like yourself found SA is a pain. Finding a nice CaK scope is on my bucket list. If cost was no object i'd possibly go for the TOA130. Not sure how often my seeing would let me get much more than that aperture wise.


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