ROT2 command of IRIS

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Re: ROT2 command of IRIS

Post by highfnum » Thu Dec 15, 2016 4:19 pm

What is rate that slits vibrated

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Re: ROT2 command of IRIS

Post by Merlin66 » Thu Dec 15, 2016 9:22 pm

John,
Around 30-40 oscillations per second is needed for persistence of vision, p 66-67.
"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: ROT2 command of IRIS

Post by Merrill55 » Thu Dec 15, 2016 9:53 pm

Maybe,for visual using oscillations is 20-30 per second vibration and for graphical using is 5-10 per second.
For photo it need not make vibrate so fast. Conposite procedure is useful for smoothing.

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Re: ROT2 command of IRIS

Post by Wah » Mon Dec 19, 2016 2:16 pm

Hi Merrill55,
I am sorry that the SLiM has some problem to process the avi files because it is using an external library to decode the avi format.
If you use the mono 8bit or 16bit SER file format to capture the video, it should be able to support without problem (I hope)
I was too lazy to implement the code for 16bit SER vertical mode, please make the spectral lines horizontally while using 16bit SER.
Also, using ROI function to reduce the video resolution can help improving the processing speed and also the capturing frame rate.
Thanks!

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Re: ROT2 command of IRIS

Post by Merrill55 » Tue Dec 20, 2016 3:10 am

Thanks Wah.
I'm beginner in SHG. So I must learn more about dogital procedure.
ROi is helpful for me.
I tried Vdub and SLim recently.
I Try to more experience about DigitalSpectroheliograph.

Thank you.

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Re: ROT2 command of IRIS

Post by Merlin66 » Tue Dec 20, 2016 3:19 am

Toshio,
You may find the new book "Imaging Sunlight -using a digital spectroheliograph" useful.
It has a whole chapter on the various processing software currently available and how to use them for the SHG.
"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: ROT2 command of IRIS

Post by Merrill55 » Tue Dec 20, 2016 3:29 am

Trial h-alpha photo.

Very poor image.
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Re: ROT2 command of IRIS

Post by Montana » Tue Dec 20, 2016 9:52 am

Wow! that's a great close up, well done :bow

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Re: ROT2 command of IRIS

Post by Merrill55 » Tue Dec 20, 2016 10:23 am

Thanks Alexandra.

I will try to get more detail the solar surface.

Toshio

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Re: ROT2 command of IRIS

Post by highfnum » Fri Dec 23, 2016 4:56 pm

Toshio - do you know of any other SHG or SHS in Japan (amateur)

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Re: ROT2 command of IRIS

Post by Merrill55 » Sat Dec 24, 2016 5:09 am

I know one amateur. His name is Takashi Sakae. He is a teacher of high school.

I don't know any other amateur without him.
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Re: ROT2 command of IRIS

Post by highfnum » Sat Dec 24, 2016 10:56 am

Very nice

Ken - guess you have to update total counter :band

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Re: ROT2 command of IRIS

Post by Merlin66 » Sat Dec 24, 2016 8:05 pm

John,
Already done!!
I'll look at translating the documents.
"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: ROT2 command of IRIS

Post by Merrill55 » Sun Dec 25, 2016 9:59 am

My Christmas solar image is as follows;
Somewhat blur image.
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Re: ROT2 command of IRIS

Post by Montana » Sun Dec 25, 2016 10:10 am

Wow!! some lovely filaments, well done and Merry Christmas! :hamster:
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Re: ROT2 command of IRIS

Post by Merrill55 » Sun Dec 25, 2016 10:36 am

Merry Christmas all.
Have a nice holy night !!

Toshio (a part of HYLOV P.233)

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Re: ROT2 command of IRIS

Post by highfnum » Sun Dec 25, 2016 1:15 pm

Picture improved
Enjoy :hamster:

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Re: ROT2 command of IRIS

Post by Merrill55 » Sat Dec 31, 2016 7:22 am

Trial h-alpha photo by short SHG. 2016_12_31
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Re: ROT2 command of IRIS

Post by highfnum » Sat Dec 31, 2016 4:22 pm

Much better
Focus improvement is noticeable

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Re: ROT2 command of IRIS

Post by Spectral Joe » Mon Jan 02, 2017 2:25 am

Yes, it's shaping up. I see two immediate issues. First, there's a lot of stray light. This can be due to misplaced reflection traps, but in your case it's likely back reflections from the binoviewer. Second, there is noticeable vignetting in the direction along the slit, usually the result of not having the telescope objective imaged onto the grating. It's a common problem, fixed by using a field lens at the entrance slit. Overall, though. this is a very good start.
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: ROT2 command of IRIS

Post by Montana » Tue Jan 03, 2017 8:11 am

This is a massive improvement, that is a tremendous image :hamster: :bow
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Re: ROT2 command of IRIS

Post by Merrill55 » Tue Jan 03, 2017 12:13 pm

Bartolick;

Yes,I should pay attention to stray light. I recognize it.
Littrow lens cause a strong ghost.(Acromatic lens cause four goast)
The binoviewer cause a strong ghost of the slit shape.
Therefore I block it using red filter (R64) in the lower part of the binoviewer.
When I use other wavelengths, the use of the color filter corresponding to each will be necessary.

The serious problem is not good quality collimator lens which light passes twice.
I must exchange on an apochromatic lens.
Probably I think that the image becomes a little sharper.

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Re: ROT2 command of IRIS

Post by Merrill55 » Sun Dec 10, 2017 3:47 am

Hi all;
Recent my SHG image.
Low contrast !!
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Re: ROT2 command of IRIS

Post by Montana » Sun Dec 10, 2017 11:55 am

Very nice prom in the south east :hamster: :bow
Alexandra

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Re: ROT2 command of IRIS

Post by marktownley » Sat Dec 16, 2017 12:30 pm

Very good!
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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