Ken,
Thank you for your valuable information.
I was python‘s user long time ago.
I will understand the procedure of the soft.
Next time I will try this.
regards,

Ohnishi

Optical path is as follows;
Front red filter 80mm F/6 telescope
Binoviewer 70mm F/6 collimator
Slit width is about 10 microns.
1800L/mm Richardson Grating
Relay lens ASI174MM

Hi Ken,
My procedure is as follows;
SharpCap4.0 -> VirtualDub -> Wah's Slim -> Photoshop(BMP -> JPG)

Ohnishi

My new Digital spectroheliograph
Telescope 80mm F/6
Collimator 70mm F/6
Grating 1800L/mm 5000A Brazed
ASI174mm

Amazing !!

Very impressive !
I try to get good spectro-heliogram again.
Quiet sun has gone.

Andover Corporation makes semi-custom interference filters.
However, it exceeds 2000 dollars at 25 mm diameter 0.5 nm.

Thank you Alexandra.
I want to contact Wolfgang Lille.

Merrill55

Rondi 's Coronagraph site is as follows;
http://www.astrosurf.com/rondi/coro/
My prominence scope is same as this.

Thank you for your reply. Of course, coronagraph and prominence scope I understand the difference. I can't observe the corona with Pic du Midi. The scope with the interference filter removed is a complete coronagraph. I would like to see prominence in a wider range of wavelengths. I used a blocking ...

I am making a prototype coronagraph.
However, I have not obtained sufficient results.
The filter I'm using now is Andover Corp's 10A H-alpha.
Does anyone know of a company that sells filters of about 5A?

Merrill55

It looks very nice!

Old Photos of my SHG

Solar sueface 6563A

Merrill55

Fantastic !!

Very interesting!
1.5A interference filter is not suitable for mirror coronagraph.
Perhaps 10~5A filter OK.
But It's difficult to get one. Some amateur spent about EURO3000.
I seeking cheap filter recently.
I am merrill55=MERRILL.