Search found 5 matches

by MERRILL
Mon Jun 01, 2020 5:53 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Coming back...
Replies: 15
Views: 164

Re: Coming back...

It looks very nice!
by MERRILL
Tue Apr 28, 2020 8:10 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Today's solar surface by SHG
Replies: 9
Views: 1161

Re: Today's solar surface by SHG

Old Photos of my SHG
by MERRILL
Tue Apr 28, 2020 12:30 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: Today's solar surface by SHG
Replies: 9
Views: 1161

Today's solar surface by SHG

Solar sueface 6563A

Merrill55
by MERRILL
Tue Apr 07, 2020 11:23 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Protuberance approach vs. Coronograph
Replies: 19
Views: 6207

Re: Protuberance approach vs. Coronograph

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.