need some help with my atempt to build SHG
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need some help with my atempt to build SHG
im using 60 X 1000 objective as main lens
2400 lines per mm grating
2 50 mm lens for collimation at f/4
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Re: need some help with my atempt to build SHG
here is shot with just spectroscope it self
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Re: need some help with my atempt to build SHG
but
how do I know I got sun focused on spectrum
should H-aline "light" up and change?
cause it does not - it still black line
how do I know I got sun focused on spectrum
should H-aline "light" up and change?
cause it does not - it still black line
- swisswalter
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Re: need some help with my atempt to build SHG
Hi John
wonderful mod, that looks great. Sorry I can't help at all
wonderful mod, that looks great. Sorry I can't help at all
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Re: need some help with my atempt to build SHG
John,
Focusing the solar image on the slit gap will be a bit of trial and error....
The Ha (and all the other "absorption" lines) will remain dark (by contrast to the surrounding continuum). It's only when the slit scans over a "brighter" feature (in the Ha) that parts the line will show some detail. e.g. Active areas/ proms.
How you do set your slit gap? How do you know the slit gap is parallel to the grating?
A spectroscope with 50mm lens will give a reduced dispersion and resolution - to get down to the 0.5A range you may have to rethink and go for longer fl lenses.
Give it a go and drift scan across the solar surface......
Focusing the solar image on the slit gap will be a bit of trial and error....
The Ha (and all the other "absorption" lines) will remain dark (by contrast to the surrounding continuum). It's only when the slit scans over a "brighter" feature (in the Ha) that parts the line will show some detail. e.g. Active areas/ proms.
How you do set your slit gap? How do you know the slit gap is parallel to the grating?
A spectroscope with 50mm lens will give a reduced dispersion and resolution - to get down to the 0.5A range you may have to rethink and go for longer fl lenses.
Give it a go and drift scan across the solar surface......
"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
- DSobserver
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Re: need some help with my atempt to build SHG
Hello
As a first shot, I would recomend Cak line : they show a lot of bright area Vs Ha.
What people recommend me (and it works!) is :
1- focus the collimator lens using a digital camera with infinity focus
2- focus camera lens in order to get clear spectra
3- focus telescope lens in order to get clear sun edge....and be able to see clear/dark areas on the absorbtion lines
As a first shot, I would recomend Cak line : they show a lot of bright area Vs Ha.
What people recommend me (and it works!) is :
1- focus the collimator lens using a digital camera with infinity focus
2- focus camera lens in order to get clear spectra
3- focus telescope lens in order to get clear sun edge....and be able to see clear/dark areas on the absorbtion lines