Recent Digital SHG

I LOVE finding out about different ways to appreciate the Sun and light in general. Use this forum to post your info or questions about various outside the mainstream ways to appreciate our life giving star!
Post Reply
Merrill55
Oh, I get it now!
Oh, I get it now!
Posts: 42
Joined: Tue Nov 15, 2016 12:06 pm

Recent Digital SHG

Post by Merrill55 »

Trial H-alpha photo in 2018_07_14_07:12(JST) by Digital Spectro_Helio_Graph.
Attachments
07_12_27_000_CUP_RG_C.jpg
07_12_27_000_CUP_RG_C.jpg (2.79 MiB) Viewed 5384 times


User avatar
Merlin66
Librarian
Librarian
Posts: 3970
Joined: Tue Dec 13, 2011 1:23 pm
Location: Junortoun, Australia
Has thanked: 173 times
Been thanked: 615 times
Contact:

Re: Recent Digital SHG

Post by Merlin66 »

More detail on the SHG system, please!!!


"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
Merrill55
Oh, I get it now!
Oh, I get it now!
Posts: 42
Joined: Tue Nov 15, 2016 12:06 pm

Re: Recent Digital SHG

Post by Merrill55 »

Telescope is Diameter 80mm and Focal length 910mm of acromatic lens.
Collimator, Camera lens is Diameter 70mm and Focal length 700mm of achromatic lens.
Slit width is about 20 micron.
I used 2* barlow lens. Telescope's effective focal length is about 1800mm.
CCd camera is ASI1600MM.


Merrill55
Oh, I get it now!
Oh, I get it now!
Posts: 42
Joined: Tue Nov 15, 2016 12:06 pm

Re: Recent Digital SHG

Post by Merrill55 »

Grating is 1800 grooves/mm,68.5mm*68.5mm of Richaedson Gratings.


User avatar
p_zetner
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1644
Joined: Sun Mar 18, 2012 4:59 pm
Location: Winnipeg, Manitoba, Canada
Has thanked: 166 times
Been thanked: 719 times

Re: Recent Digital SHG

Post by p_zetner »

Very nice imaging, especially using a telescope focal length of 1800mm. Your seeing conditions must have been relatively stable.


highfnum
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 2031
Joined: Sat Nov 24, 2012 2:33 pm
Has thanked: 57 times
Been thanked: 1189 times

Re: Recent Digital SHG

Post by highfnum »

excellent detail


User avatar
Merlin66
Librarian
Librarian
Posts: 3970
Joined: Tue Dec 13, 2011 1:23 pm
Location: Junortoun, Australia
Has thanked: 173 times
Been thanked: 615 times
Contact:

Re: Recent Digital SHG

Post by Merlin66 »

Yes, definitely a very good SGH image!!
I'd appreciate seeing an image of your set-up.......


"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy  
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
User avatar
DSobserver
Almost There...
Almost There...
Posts: 582
Joined: Sun Feb 19, 2012 2:36 pm
Location: FRANCE
Been thanked: 19 times

Re: Recent Digital SHG

Post by DSobserver »

Waouhhhh
Fantastic result!


Merrill55
Oh, I get it now!
Oh, I get it now!
Posts: 42
Joined: Tue Nov 15, 2016 12:06 pm

Re: Recent Digital SHG

Post by Merrill55 »

Thank you.
My SHG has low contrast and I have an optical axis is not to match definitely.
For the good capture, good seeing is necessary.
Including a background, as for the good seeing of 3 minutes, it is rare.
Birds and clouds, an airplane, the strong wind are enemies.
I am improving it now to extend a collimator lens focus.
Attachments
H-Beta
H-Beta
07_38_50_001_H-beta_RG.jpg (1.22 MiB) Viewed 5281 times
H-Alpha
H-Alpha
06_37_03_000.jpg (1022.72 KiB) Viewed 5281 times
H-Alpha
H-Alpha
06_50_09_000_CUP.jpg (2.14 MiB) Viewed 5281 times
Last edited by Merrill55 on Mon Jul 16, 2018 11:06 am, edited 1 time in total.


User avatar
marktownley
Librarian
Librarian
Posts: 42272
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20435 times
Been thanked: 10245 times
Contact:

Re: Recent Digital SHG

Post by marktownley »

Nice captures!


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!
User avatar
Spectral Joe
Ohhhhhh My!
Ohhhhhh My!
Posts: 120
Joined: Wed Mar 14, 2012 4:34 am
Location: Livermore, California

Re: Recent Digital SHG

Post by Spectral Joe »

If these are trials then you are definitely on the right track! Excellent for initial efforts. Definitely some stray light, have you trapped the ghost images of the slit?


Observing the Sun with complex optical systems since 1966, and still haven't burned, melted or damaged anything.
Not blind yet, either!
Light pollution? I only observe the Sun, magnitude -26.74. Pollute that!
Merrill55
Oh, I get it now!
Oh, I get it now!
Posts: 42
Joined: Tue Nov 15, 2016 12:06 pm

Re: Recent Digital SHG

Post by Merrill55 »

Thank you Joe.
Not yet.
I blocked almost stray light carefully.
I suppose it owes the rear surface of collimator lens.
For h-alpha light,I use a red filter on the front of telescope lens .
I will use the block bead for strong gohst.


User avatar
Montana
Librarian
Librarian
Posts: 34563
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK
Has thanked: 17672 times
Been thanked: 8791 times

Re: Recent Digital SHG

Post by Montana »

These are tremendous, so much detail :bow :bow
Alexandra


Post Reply