17 July: Some H alpha and Ca K shots

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p_zetner
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17 July: Some H alpha and Ca K shots

Post by p_zetner »

Hello Everyone;

Here are some shots of the AR as it nears the limb.
H alpha shots taken with Istar 100mmf12 scope (3.9X telecentric, Daystar QPE 0.6A and reducers) and CaK shots taken with Stellarvue 115mmf7 and custom optics.

Cheers, Peter.


H alpha: Focal ratio ~f24
2018-07-17-091648_AS2_proc_crop.png
2018-07-17-091648_AS2_proc_crop.png (1.43 MiB) Viewed 1717 times
H alpha: Focal ratio ~f33
2018-07-17-090531_AS1_proc_crop.png
2018-07-17-090531_AS1_proc_crop.png (1.37 MiB) Viewed 1717 times
Ca K: Focal ratio ~f21
2018-07-17-103356_AS2_proc_crop.png
2018-07-17-103356_AS2_proc_crop.png (1.26 MiB) Viewed 1717 times
Ca K: Focal ratio ~f34
2018-07-17-100147_AS2_proc_crop.png
2018-07-17-100147_AS2_proc_crop.png (1.42 MiB) Viewed 1717 times
Last edited by p_zetner on Wed Jul 18, 2018 12:57 am, edited 1 time in total.


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Re: 17 July: Some H alpha and Ca K shots

Post by ffellah »

Very nice views in both frequencies, Peter, high contrast and resolution.

Franco


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Re: 17 July: Some H alpha and Ca K shots

Post by marktownley »

Very nice Peter. Super results in CaK.


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Re: 17 July: Some H alpha and Ca K shots

Post by Montana »

Wow!! those CaK images are divine :bow
Alexandra


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Re: 17 July: Some H alpha and Ca K shots

Post by eroel »

Peter:
Superb CaK shots, what custom filters?
Good day,
Eric.


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Re: 17 July: Some H alpha and Ca K shots

Post by p_zetner »

Thanks, everyone, for the comments!

Eric: Here's a diagram of the optical layout. It started out as a telecentric design but filters are actually situated in a fairly well collimated beam. The positions of the Lunt B1800 and the Omega CaK are reversed in the actual device (don't think that matters optically ... an assembly convenience). Lenses are Edmund Optics achromatic doublets. Let me know if you want more information about spacings etc.

Cheers, Peter.
115mmf7  - Telecentric EOv3 - uv - layout.png
115mmf7 - Telecentric EOv3 - uv - layout.png (18.49 KiB) Viewed 1675 times


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Re: 17 July: Some H alpha and Ca K shots

Post by rsfoto »

Hi Peter,

Superb images. I found your post here in Solar Chat about your telecentric and that made me understand my set up for my new Quantum much better.

This posting here viewtopic.php?f=9&t=24706

and thanks a lot


regards Rainer

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San Luis Potosi Mexico

North 22° West 101°
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Re: 17 July: Some H alpha and Ca K shots

Post by mattwastell »

Hi Peter
Great shots - the CaK images are fantastic - thanks for sharing.


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Re: 17 July: Some H alpha and Ca K shots

Post by p_zetner »

Thanks Matt and Rainer.

Rainer: I’m glad you found the post helpful. Referring to your earlier post viewtopic.php?f=10&t=24786&p=222771#p222771, I can’t really answer questions about optimal spacings with commercial focal extenders like the Televue because their designs are proprietary and so I don’t have the optical prescriptions to model them with my ray tracing software.

Cheers, Peter.


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Re: 17 July: Some H alpha and Ca K shots

Post by Carbon60 »

Nice images and good information, Peter.

Stu.


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Re: 17 July: Some H alpha and Ca K shots

Post by allhoest »

Very contrasted!
CS
Alex


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