High quality optical parts are the bottlenecks, they're much more difficult to find than other parts.

I think yes:
http://solarchat.natca.net/viewtopic.php?f=8&t=13527

Congratulations!

Good to see new SHG images!

I need time and weather to take new pictures.

I am still making mine~

Normal version.

20151224 Silent night Halpha vs CaK sun

My first question raised
"1. If the light source is bright enough, why should we consider high efficiency?"

because of the topic question:
"does anyone use prisms instead of gratings for SHG?"

Two questions:
1. If the light source is bright enough, why should we consider high efficiency?
2. Does prism absorb some parts of the spectrum?

Good job!

It should work because it does NOT required advanced functions of PS.

(edited)

The bands are not perfectly horizontal, so it cannot be removed by normal processing.

The program I wrote was intended to merge spectral lines only, no deband functions.

You may submit the original and let me help you.

Sorry for the late reply, here is the result.

Can you give me the raw so I can help you remove the bands?

RIP swisswalter...

This is the record he made in this forum:
Total posts: 18020
[11.07% of all posts / 31.28 posts per day]

20150904 Sun before going to work this morning

I really hope I can have chance to see through a shs in future.

Can those 5 images be quality filtered + stacked as normal filter images?

For those large solar telescope with adaptive optics, the details of SHG can be much better?

Regular slits can easily be dusty and hard to be cleaned, for me. If the blades touch each other, it also can be damaged. Both can cause serious banding problem to the SHG images. That's why I would like to try glass slit instead. For the reflectivity, I can only test visible light based on my camer...