SHG out of hibernation!

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p_zetner
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SHG out of hibernation!

Post by p_zetner » Sat May 23, 2015 2:41 am

Hello Everyone.

The weather is finally cooperating and occasional imaging opportunities come along!
Here is the 1st batch from my SHG this year. (Images taken in the CaII H line.)
The Configuration.
Telescope: 1000mmf f/10 catadioptric
Collimator Lens: 200mmf Pentax Takumar telephoto with Televue 2.5x Barlow.
Slit: 25um
Grating: 3600 /mm (25mm x 50mm)
Camera Lens: 135mm Tele-Xenar telephoto with Komura 2x extender.
Camera: Point Grey Grasshopper Express 1600px X 1200px.

Cheers.
Peter.
CaH Mosaic Labels.png

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swisswalter
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Re: SHG out of hibernation!

Post by swisswalter » Sat May 23, 2015 5:18 am

Hi Peter

wonderful stuff, excellent pics, please keep them coming
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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Re: SHG out of hibernation!

Post by marktownley » Sat May 23, 2015 9:58 am

These are fantastic! very impressive indeed. Seeing pictures like this really does make me want to make a SHG. I hope you get many opportunities to image this year, and please share everyone of them!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: SHG out of hibernation!

Post by Merlin66 » Sat May 23, 2015 1:39 pm

Peter,
Well done!
Excellent SHG images - as usual!!!

Mark,
Wait until the book comes out later this year, it will give you all the info you'll ever need.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: SHG out of hibernation!

Post by Derek Klepp » Sat May 23, 2015 7:35 pm

Thanks Peter

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Re: SHG out of hibernation!

Post by Montana » Mon May 25, 2015 11:35 am

Absolutely superb! lots of great filaments in there :hamster: :bow :bow :bow looks very similar to Ca K, it would be nice to see a side by side comparison, it would be very interesting for me :)

Alexandra

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Re: SHG out of hibernation!

Post by DSobserver » Mon May 25, 2015 8:23 pm

wow! nice shot!

Alexandra, Cak CaH are usually similar...

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Re: SHG out of hibernation!

Post by highfnum » Mon May 25, 2015 11:57 pm

Yes I agree with Montana
thx for doing ca H line

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Re: SHG out of hibernation!

Post by p_zetner » Tue May 26, 2015 4:26 pm

Thanks for your comments, everyone!

Alexandra: Here is the requested CaH - CaK comparison! Bearing in mind that I've used different processing for each series, they're definitely similar. I think the quality of the CaH images might be a little better than the CaK, likely because my system seems to lose efficiency as I go further into the uv. Because of this and because of the fact that the CaK line is stronger in absorption (hence, darker), I have more light to work with at the CaH wavelength. On the other hand, the CaK line seems to show more contrast away from line centre. This comes out in the comparison between CaH1v and CaK1v and is, likely, a real effect, not too dependent on processing. This seems to make sense in light of the fact that CaK is the stronger (hence, deeper and wider) line. It probably also explains why commercial, narrow bandpass filters are mostly developed for the K line instead of the H line.

Cheers.
Peter.

CaK images:
CaK Mosaic labels.png
Side by side comparison of CaK wth CaH:
CaH CaK Compare.png

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Re: SHG out of hibernation!

Post by swisswalter » Wed May 27, 2015 4:07 am

Hi Peter

an excellent comparison
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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Re: SHG out of hibernation!

Post by marktownley » Wed May 27, 2015 5:47 am

Very interesting Peter!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: SHG out of hibernation!

Post by Carbon60 » Wed May 27, 2015 5:54 am

Great set of images, Peter. Your SHG set-up is working exceptionally well!

Stu.
Lunt LS60THa B1200 PTFT
150mm H-alpha Solar telescope with Lunt35 mod
DMK41, Basler acA1920-155
NEQ6 Pro-mount
Fluxgate Magnetometers (1s and 150s Cadence)
More images at http://www.flickr.com/photos/solarcarbon60/

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Re: SHG out of hibernation!

Post by Montana » Wed May 27, 2015 9:23 am

Very interesting, many thanks :bow :bow :bow The H line has much more prominent filaments though in the H2v so if you are fascinated by filaments it would seem the H line is the place to look :)

Alexandra

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Re: SHG out of hibernation!

Post by highfnum » Wed May 27, 2015 9:27 pm

thanks for comparison
always wanted to see caH caK side by side

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