18 an 20th august SHG shot

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DSobserver
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18 an 20th august SHG shot

Post by DSobserver » Wed Aug 26, 2015 10:28 am

I finally found time to play with my SHG.
Here are 4 shot from 18th of august :

Ha
Image
Cak
Image
And there nice proms
Image
Hb
Image

On 20th I found with imageJ soft a way to trate He pictures following peter advices.
Unfortunatelly probably optical mis alignement create over exposure, but result is on the right way
Image

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Re: 18 an 20th august SHG shot

Post by highfnum » Wed Aug 26, 2015 9:46 pm

nice

one of these days I got to try helium d line

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Re: 18 an 20th august SHG shot

Post by p_zetner » Wed Aug 26, 2015 10:30 pm

Nice work, Vincent!
Yes, be careful not to overexpose when capturing the HeD3 line. The situation is a bit different than for the strong lines.
Just to clarify: When I try the HeD3 line, I make a series of images (2px spectral slices) covering the region around He and choose (by trial and error) one of these to subtract out as the background (continuum) image. Sometimes it makes a big difference to image quality to take the background image you've chosen and scale it (a factor of 0.90x to 0.97x), using the ImageJ "process" menu, before subtracting. At least one of the background subtracted images should be good enough to continue processing.

Cheers.
Peter.

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Montana
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Re: 18 an 20th august SHG shot

Post by Montana » Thu Aug 27, 2015 9:00 am

Great images! well done :bow :bow :bow

Alexandra

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Re: 18 an 20th august SHG shot

Post by marktownley » Mon Aug 31, 2015 8:44 pm

Very impressive. Making me want to have a go of this more and more...

How many 'strips' make up a full disk?
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