SolarChat!

Wah

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

Wah

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

Wah

Congratulations!

Wah

Wah

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Good to see new SHG images!

I need time and weather to take new pictures.

Wah

I am still making mine~

Wah

Wah

Normal version.

Wah

20151224 Silent night Halpha vs CaK sun

Wah

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?"

Wah

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?

Wah

Good job!

Wah

Wah

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

(edited)

Wah

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

Wah

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

You may submit the original and let me help you.

Wah

Sorry for the late reply, here is the result.

Wah

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

Wah

RIP swisswalter...

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

Wah

20150904 Sun before going to work this morning

Wah

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

Wah

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

Wah

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

Wah

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...

Wah

Maybe this slit is suitable for your mirror testing application?
http://adamslab.co.uk/Students%20Lab/Ph ... uct_id=816

Wah

Yes, my slit is using chromium coating.
I still don't have time to test it because I just had some time to capture the sunspots 2396

Wah

I think seeing is the key factor to capture good images.
Good luck to all of you!

Wah

20150808 Sunspot 2396

Wah

Excellent results!

Allow me to remove the bands for you~

Wah

Glass doesn't dissipate heat very well as metal does, I was expecting the reflectivity be higher to reflect more solar heat away. For example, 95% reflectivity means only 5% of energy / heat is absorbed by the coating. Now the reflectivity is not very high, that means the glass being exposed to the ...

Wah

Light pass through the coating is very little, I only could see very dim image of the light bulb. So I guess 3X% of light is absorbed by the coating. I will do some stress test later when I have time and the weather goes fine. BTW, the manufacturer told me that such coating was designed to withstand...

Wah

Here is a reflectivity comparison to another glass slit that I have. http://adamslab.co.uk/Students%20Lab/Physics%20-%20Light%20and%20Optics?product_id=816 I took some pictures before and after reflection. The reflectivity of both slits are lower than my expectation, and the China made one is not a ...

Wah

I recently have tailor made several glass optical slits from mainland China.
The slits quality seems to be better than what I originally expected.
But the reflectivity is only about 62% which is lower than my expectation.

3 slits in one glass plate: 10, 20, 30 um
Glass plate 30X2mm

Wah

Wah

Good clean slit and no de-banding is needed!

Wah

Can you post the raw images, so I can help you to de-band them?

Wah

Hi Vincent, I think you must have at least rotated or skewed the images from the raw, haven't you?

Wah

It seems the images are not raw which the bandings are not vertical. That will dramatically increase the difficulty of removing them.

Wah

Peter, I notice that most of the images have dim left and right side and bright top and bottom.
Do you know what causes it?

I've tried to reduce such effect.

Wah

Stunning results!

I just wonder why it seems the solar poles in H-beta are featureless?

Wah

Wah

Let me process it.

Wah

You may download it from here:
http://www.hkastroforum.net/viewtopic.p ... 902#274902

Wah

Which function do you mean? I think the UI doesn't have a field called "scan box" ?

Wah

2nd trial to remove vertical stripes:

Wah

I use skew like this.

Wah

Congratulations!

You may use "skew" and "resize" (1 direction only) functions to make the solar disk round.

The upper part of the sun is a bit off band, it seems not from the smiling effect if the original video is in horizontal.

Wah

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?

Wah

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