ok guys need some help
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ok guys need some help
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
?
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
try to build solar image but all I got was this
tried another line for hell of it and got this
tried another line for hell of it and got this
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Re: ok guys need some help
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
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
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Re: ok guys need some help
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.
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
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Re: ok guys need some help
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
how do you adjust aspect ratio -- is there a math trick
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Re: ok guys need some help
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
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)
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
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"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
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Re: ok guys need some help
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?
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
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???
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???
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Re: ok guys need some help
Hi John
I am happy that an expert is helping you
I am happy that an expert is helping you
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Re: ok guys need some help
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.
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Re: ok guys need some help
Interesting topic!
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
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.
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
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
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
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.
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
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"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: ok guys need some help
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!
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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Re: ok guys need some help
Hi John
that is a good progress
that is a good progress
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
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Re: ok guys need some help
Well done!
A bit more practise and you'll be kicking goals.....
Stick with the narrow slit gap...
Get the exposure to give you a deep absorption line, keep checking your focus and play around with the extraction of various bandwidths (# of pixels) from the spectral image.
You may also have to throw a light proof cover over the SHG to reduce unwanted reflections etc.
Onwards and Upwards.
A bit more practise and you'll be kicking goals.....
Stick with the narrow slit gap...
Get the exposure to give you a deep absorption line, keep checking your focus and play around with the extraction of various bandwidths (# of pixels) from the spectral image.
You may also have to throw a light proof cover over the SHG to reduce unwanted reflections etc.
Onwards and Upwards.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: ok guys need some help
Sure, it can be cleaned with alcohol/water mix....
The scan lines won't be coming from the slit gap - usually dust etc. will show as continuous "transversalium" lines across the image...
Hmmm
Question: in the presented image the scan seems to be across (horizontally) - is this correct?
The scan lines won't be coming from the slit gap - usually dust etc. will show as continuous "transversalium" lines across the image...
Hmmm
Question: in the presented image the scan seems to be across (horizontally) - is this correct?
"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
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: ok guys need some help
It's OK....
The vertical lines in your image are not caused by dust...
They come from somewhere in the processing..
The vertical lines in your image are not caused by dust...
They come from somewhere in the processing..
"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
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer