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Re: ROT2 command of IRIS

Posted: Thu Dec 15, 2016 4:19 pm
by highfnum
What is rate that slits vibrated

Re: ROT2 command of IRIS

Posted: Thu Dec 15, 2016 9:22 pm
by Merlin66
John,
Around 30-40 oscillations per second is needed for persistence of vision, p 66-67.

Re: ROT2 command of IRIS

Posted: Thu Dec 15, 2016 9:53 pm
by Merrill55
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.

Re: ROT2 command of IRIS

Posted: Mon Dec 19, 2016 2:16 pm
by Wah
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!

Re: ROT2 command of IRIS

Posted: Tue Dec 20, 2016 3:10 am
by Merrill55
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.

Re: ROT2 command of IRIS

Posted: Tue Dec 20, 2016 3:19 am
by Merlin66
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.

Re: ROT2 command of IRIS

Posted: Tue Dec 20, 2016 3:29 am
by Merrill55
Trial h-alpha photo.

Very poor image.

Re: ROT2 command of IRIS

Posted: Tue Dec 20, 2016 9:52 am
by Montana
Wow! that's a great close up, well done :bow

Alexandra

Re: ROT2 command of IRIS

Posted: Tue Dec 20, 2016 10:23 am
by Merrill55
Thanks Alexandra.

I will try to get more detail the solar surface.

Toshio

Re: ROT2 command of IRIS

Posted: Fri Dec 23, 2016 4:56 pm
by highfnum
Toshio - do you know of any other SHG or SHS in Japan (amateur)

Re: ROT2 command of IRIS

Posted: Sat Dec 24, 2016 5:09 am
by Merrill55
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.

Re: ROT2 command of IRIS

Posted: Sat Dec 24, 2016 10:56 am
by highfnum
Very nice

Ken - guess you have to update total counter :band

Re: ROT2 command of IRIS

Posted: Sat Dec 24, 2016 8:05 pm
by Merlin66
John,
Already done!!
I'll look at translating the documents.

Re: ROT2 command of IRIS

Posted: Sun Dec 25, 2016 9:59 am
by Merrill55
My Christmas solar image is as follows;
Somewhat blur image.

Re: ROT2 command of IRIS

Posted: Sun Dec 25, 2016 10:10 am
by Montana
Wow!! some lovely filaments, well done and Merry Christmas! :hamster:
Alexandra

Re: ROT2 command of IRIS

Posted: Sun Dec 25, 2016 10:36 am
by Merrill55
Merry Christmas all.
Have a nice holy night !!

Toshio (a part of HYLOV P.233)

Re: ROT2 command of IRIS

Posted: Sun Dec 25, 2016 1:15 pm
by highfnum
Picture improved
Enjoy :hamster:

Re: ROT2 command of IRIS

Posted: Sat Dec 31, 2016 7:22 am
by Merrill55
Trial h-alpha photo by short SHG. 2016_12_31

Re: ROT2 command of IRIS

Posted: Sat Dec 31, 2016 4:22 pm
by highfnum
Much better
Focus improvement is noticeable

Re: ROT2 command of IRIS

Posted: Mon Jan 02, 2017 2:25 am
by Spectral Joe
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.

Re: ROT2 command of IRIS

Posted: Tue Jan 03, 2017 8:11 am
by Montana
This is a massive improvement, that is a tremendous image :hamster: :bow
Alexandra

Re: ROT2 command of IRIS

Posted: Tue Jan 03, 2017 12:13 pm
by Merrill55
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.

Re: ROT2 command of IRIS

Posted: Sun Dec 10, 2017 3:47 am
by Merrill55
Hi all;
Recent my SHG image.
Low contrast !!

Re: ROT2 command of IRIS

Posted: Sun Dec 10, 2017 11:55 am
by Montana
Very nice prom in the south east :hamster: :bow
Alexandra

Re: ROT2 command of IRIS

Posted: Sat Dec 16, 2017 12:30 pm
by marktownley
Very good!