Recent Digital SHG

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Merrill55
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Recent Digital SHG

Post by Merrill55 » Sat Jul 14, 2018 5:53 am

Trial H-alpha photo in 2018_07_14_07:12(JST) by Digital Spectro_Helio_Graph.
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07_12_27_000_CUP_RG_C.jpg
07_12_27_000_CUP_RG_C.jpg (2.79 MiB) Viewed 491 times

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Merlin66
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Re: Recent Digital SHG

Post by Merlin66 » Sat Jul 14, 2018 8:15 am

More detail on the SHG system, please!!!
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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Merrill55
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Re: Recent Digital SHG

Post by Merrill55 » Sat Jul 14, 2018 9:07 am

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
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Re: Recent Digital SHG

Post by Merrill55 » Sat Jul 14, 2018 9:44 am

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

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p_zetner
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Re: Recent Digital SHG

Post by p_zetner » Sat Jul 14, 2018 9:34 pm

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

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Re: Recent Digital SHG

Post by highfnum » Sat Jul 14, 2018 11:08 pm

excellent detail

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Re: Recent Digital SHG

Post by Merlin66 » Sun Jul 15, 2018 6:12 am

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.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: Recent Digital SHG

Post by DSobserver » Sun Jul 15, 2018 1:02 pm

Waouhhhh
Fantastic result!

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Re: Recent Digital SHG

Post by Merrill55 » Mon Jul 16, 2018 12:59 am

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
07_38_50_001_H-beta_RG.jpg
H-Beta
07_38_50_001_H-beta_RG.jpg (1.22 MiB) Viewed 388 times
06_37_03_000.jpg
H-Alpha
06_37_03_000.jpg (1022.72 KiB) Viewed 388 times
06_50_09_000_CUP.jpg
H-Alpha
06_50_09_000_CUP.jpg (2.14 MiB) Viewed 388 times
Last edited by Merrill55 on Mon Jul 16, 2018 11:06 am, edited 1 time in total.

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Re: Recent Digital SHG

Post by marktownley » Mon Jul 16, 2018 5:07 am

Nice captures!
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Re: Recent Digital SHG

Post by Spectral Joe » Mon Jul 16, 2018 5:46 am

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!

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Re: Recent Digital SHG

Post by Merrill55 » Mon Jul 16, 2018 10:43 am

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.

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Re: Recent Digital SHG

Post by Montana » Wed Jul 18, 2018 9:27 am

These are tremendous, so much detail :bow :bow
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