ok guys need some help

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ok guys need some help

Post by highfnum » Sat Jun 13, 2015 5:45 pm

jm trying to complete my SHG
trying to make it as simple as possible
Im trying to create my PSG "personal spectro graph"
I recycled 40mm PST lens for h-alpha
I figure that is simplest

my question is when do you know you got sun focused on slit
?
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Re: ok guys need some help

Post by highfnum » Sat Jun 13, 2015 5:46 pm

using PST for telescope part
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Re: ok guys need some help

Post by highfnum » Sat Jun 13, 2015 5:48 pm

I can get lines - an early test shot
fc2_save_2015-06-12-123243-0000.jpg
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Re: ok guys need some help

Post by highfnum » Sat Jun 13, 2015 5:52 pm

try to build solar image but all I got was this
myfist.jpg
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tried another line for [hot place] of it and got this
SH.jpg
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Re: ok guys need some help

Post by swisswalter » Sun Jun 14, 2015 4:48 am

Hi John

an interesting mod. The lines are much to regular. Maybe you post a drowing of your setup . Here are specialist who can say you where to tweak
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: ok guys need some help

Post by Merlin66 » Sun Jun 14, 2015 6:45 am

John,
It looks like you have focused on the Telluric (atmospheric) lines, these are on the red side of Ha so you need to re-tune the grating to bring the Ha line into the camera field of view.

The PST objective will give you a solar image about 4mm diameter on the slit gap.
Once you've found the Ha region, set up the scope so that the image of the sun can trail across the slit. You should see the spectrum starting as a small narrow strip which, as the sun's image drifts into the slit gap, gets wider and wider. It will then start to decrease in height as the sun moves off the slit.
At this stage the task is to focus the sun's image exactly onto the slit to make the top and bottom edges of spectral image as sharp as possible. Practise, practise.....
OK when you have achieved all the above, reposition the sun's image and start an exposure.
Without an RA drive it will take about 120 sec to obtain a full disk scan.
Hope this helps.
"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: ok guys need some help

Post by highfnum » Sun Jun 14, 2015 5:01 pm

ok merlin66 tried again made some progress

typicAl fram shot of Ha
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Re: ok guys need some help

Post by highfnum » Sun Jun 14, 2015 5:03 pm

there were some clouds is this what clouds do ?and is this disk of sun at least?


how do you adjust aspect ratio -- is there a math trick
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Re: ok guys need some help

Post by highfnum » Sun Jun 14, 2015 5:06 pm

im getting disk (I think) no surface details yet and what is that Venicitin line affect ?
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Re: ok guys need some help

Post by Merlin66 » Sun Jun 14, 2015 5:11 pm

Horizontal stripes are usually artifacts from the slit edge - dust/ dirt
in this case I think it's something else - what camera/ frame rate/ exposures were you using???
The focus could be tighter.....
I just rescale the image based on the maximum height - change the width to bring the image width = height.
(The extended aspect ratio is a result of the over sampling - typically frame rate of the camera v's the scan time)
"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: ok guys need some help

Post by highfnum » Sun Jun 14, 2015 5:50 pm

1/30 sec
camelion camera
framed saved as bmp
640 by 480

Btw thanks

Ps im using wheel for slit
Number 9 100 microns
should I go tighter?


But is that the sun?

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Re: ok guys need some help

Post by highfnum » Sun Jun 14, 2015 5:53 pm

One more thing
grating 50 by 50 mm. 1800 lpm

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Re: ok guys need some help

Post by Merlin66 » Sun Jun 14, 2015 6:04 pm

You could use a tighter slit gap 35 micron...
Yes, that looks like the solar disk.
The horizontal interference doesn't show on the raw image, so I have to assume it's caused by the processing.
Are you using Wah!s software to extract the image???
"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: ok guys need some help

Post by highfnum » Sun Jun 14, 2015 6:41 pm

yippe!
no--original Dan D from France

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Re: ok guys need some help

Post by highfnum » Sun Jun 14, 2015 10:38 pm

What should exposure be?

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Re: ok guys need some help

Post by highfnum » Sun Jun 14, 2015 11:52 pm

also set gap to number 4 on wheel

cool! what a breeze to switch

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Re: ok guys need some help

Post by swisswalter » Mon Jun 15, 2015 3:36 am

Hi John

I am happy that an expert is helping you
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: ok guys need some help

Post by Merlin66 » Mon Jun 15, 2015 6:42 am

To get best data from the Ha line it should be slightly overexposed - to image the deep core and wings. The surrounding continuum will be washed out.
"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: ok guys need some help

Post by marktownley » Mon Jun 15, 2015 10:16 am

Interesting topic!
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: ok guys need some help

Post by DSobserver » Mon Jun 15, 2015 11:22 am

hello

I had in the past the same issue as you using this soft...I never could find the reason, but since I'm using wah! soft, it runs perfectly and include some crucial treatment options.

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Re: ok guys need some help

Post by Wah » Tue Jun 16, 2015 2:34 am

Thank you DSobserver for using my program!

Dear highfnum, does the pattern show in the raw avi?
If not, can you send me the video to let me try it?

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Re: ok guys need some help

Post by highfnum » Tue Jun 16, 2015 4:24 pm

Dear Wah
I do have a version of your program
by chance I chose to first use
Dan D program first

I have a sequence of bmp files
if I can convert back to avi
ill try your program
or I will attempt
again soon as clouds clear

Thanks for your offer
which I will accept if I hit a bump again

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Re: ok guys need some help

Post by highfnum » Wed Jun 17, 2015 10:40 am

Merlin66

I'm using glasses slit wheel
will that work with solar?

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Re: ok guys need some help

Post by Merlin66 » Wed Jun 17, 2015 10:44 am

Should be OK.
Remember the height of the slit gap is only 6mm and you need to make sure the surrounding slits are covered to prevent stray light.
"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: ok guys need some help

Post by highfnum » Sat Jun 20, 2015 12:01 am

ok Wah ok Merlin66

used wahs program
reduced slit size
increased exposure to 1/15

its better i can see sunspot and a prom at eight
plus
it looks better but still a way to go

still have streaks

merlin should i try to clean disk
?

could there be stria in glass?

i will try zao camera next


Wah - cool little program!

Wah i got an idea

could you write a focusing program that would integrate 1 to 2 seconds worth of lines
and display then build next 2 seconds then display and so on to help focusing


merlin66 - first time i saw proms visually like Higgins did in 1800/s -- real cool!
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