white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

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christian viladrich
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white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by christian viladrich »

Hi,

The Mewlon 250 is not the instrument that one thinks of spontaneously for solar observation. However, for high resolution, the field is large enough to cover the usual sensors. The optical performance with the Airylab telecentric is very good. Collimation stability is very good.
And the Astrosolar ND 3.8 works wonderfully. Still a ND3 version would be better, and we are still longing for the 1 m size ;-)

Here are some images taken on May 27. A lots of umbral dots are visible. The light bridge structure is splendid:

http://astrosurf.com/viladrich/astro/so ... 0-OIII.jpg
http://astrosurf.com/viladrich/astro/so ... 0-OIII.jpg

The two same regions on May 28 with the OIII filter :

http://astrosurf.com/viladrich/astro/so ... 0-OIII.jpg

and with the G-band filter. The resolution and contrast of faculae is much better. Of course, a 2 nm filter would provide even more contrast (but the Astrosolar ND 3.8 is too dark ...). With a carefull look, it can be seen that faculae are indeed the edge of convection grains:

http://astrosurf.com/viladrich/astro/so ... d-10nm.jpg

AR3315 with the OIII filter :
http://astrosurf.com/viladrich/astro/so ... 0-OIII.jpg

and in G-band, with a lot of intergranular bright points :
http://astrosurf.com/viladrich/astro/so ... nd10nm.jpg

More to come ...


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by Carbon60 »

These are stunning images, Christian. So much detail. I think I prefer the 430nm images, but it’s a tough call as they are all so wonderful.

Stu.


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by rsfoto »

Hi,

Awsome images ...


regards Rainer

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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by ffellah »

WOW, Christian ! These are tremendous... fantastic detail and resolution.

Thank you for showing us what is possible.

Franco :D


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by arnedanielsen »

Big WOW from me as well!

Absolutely fantastic images, Christian! Very inspiring!

Best regards,
Arne


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by rigel123 »

Just amazing!


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by DeepSolar64 »

Top-notch imaging! One of the best here.

James. 👍🏻👍🏻

P.S. I had to come back for another look!! :shock:
Last edited by DeepSolar64 on Sat Jun 03, 2023 4:54 am, edited 1 time in total.


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by Dennis »

Great results Christian, im glad its working well.


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by marktownley »

These are an excellent set and show the comparison at different wavelengths well! Thanks Christian.


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by christian viladrich »

Thanks to all !

Stu, sometime I prefer the OIII, other I prefer the G-band ;-)
The G-band has the edge for granulation and faculae details. The OIII is very nice for umbral dots and light bridges.


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by Averton »

We spent ages just staring at these images to take in all the wonderful details - just fantastic Christian!!


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by GreatAttractor »

Fantastic shots. I really need to try my 250 mm Newtonian this season, even if it's with ND 5 and some wider filter.
christian viladrich wrote: Fri Jun 02, 2023 6:20 pm The Mewlon 250 is not the instrument that one thinks of spontaneously for solar observation.
Another example that comes to mind is Tal 250K (sample WL shot by Dzmitry), a Klevtsov-Cassegrain with subaperture corrector.


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by pedro »

FANTASTIC images Christian, I'm speechless and in awe


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Re: white light images taken on May 27 and 28 with the Mewlon 250 / OIII and G-band

Post by Rusted »

Incredible! Even the expanded images are tack sharp! :bow


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