halpha sun on March 7th

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stef41
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halpha sun on March 7th

Post by stef41 » Wed Mar 07, 2018 4:37 pm

good morning, everyone,

passing this week at the Sirene Observatory ( https://www.obs-sirene.com/ ) on the Albion plateau in France, I was hoping for a better weather forecast than at home... well, not really.

Image

After the rain and snow of the previous days, a more clear day today (I hope to see the stars tonight!); however, as often, the wind has risen with gusts of up to 40km/h! :(

In short, I still tried different settings between the clouds to improve my images of the sun at the fs60 focus: I put the glasspath x1.25 and so the tilt ring back on again. I think I found a not too bad setting to remove the interference we saw in the center. I also unscrewed the second stack a little bit to get more luminous in the middle and darker at the edge (the opposite of previous). It's not perfect yet, I think I would need a ring allowing the rotation between the two stacks, that would be better.

I also played with the camera settings: a low gamma and a low gain also give better results. (we see less of the pattern... and more at all when the "plastic" flat is working! :) )

Otherwise, always the fs60 with the sm40 double stack, glasspath x1.25, BF10 and zwo178mm around 12h20 UT.

Image

Image

regards,
stéphane - France
Last edited by stef41 on Wed Mar 07, 2018 8:26 pm, edited 1 time in total.

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rsfoto
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Re: halpha sun on March 7th

Post by rsfoto » Wed Mar 07, 2018 8:01 pm

Great images

Rainer
regards Rainer

Observatorio Real de 14 San Luis Potosi Mexico

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ffellah
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Re: halpha sun on March 7th

Post by ffellah » Wed Mar 07, 2018 9:40 pm

Very nice images and set-up, Stephane.

Franco

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Re: halpha sun on March 7th

Post by marktownley » Fri Mar 09, 2018 6:27 am

That's a much better result!
Image
http://brierleyhillsolar.blogspot.co.uk/
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Re: halpha sun on March 7th

Post by marios i. » Fri Mar 09, 2018 12:15 pm

Wonderful set up and images

Marios

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Re: halpha sun on March 7th

Post by Montana » Fri Mar 09, 2018 12:54 pm

That is certainly a lovely observation point, I hope you saw the stars later too. Superb images of the Sun :bow :hamster:

Alexandra

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stef41
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Re: halpha sun on March 7th

Post by stef41 » Fri Mar 09, 2018 2:20 pm

thanks to you :)

@montana > yes, sun during the day and deep sky object at night... well, weather permitting! ;) It is to say if I do not sleep much sometimes when I am at the observatory! :D

cordially,
stephane - France

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eroel
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Re: halpha sun on March 7th

Post by eroel » Sat Mar 10, 2018 2:40 am

Stephane:
Very good images.
Best regards,
Eric.

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