This post is also available in: 日本語 (Japanese)
Sun 2021-09-10
During the daytime, I aligned the optical axis of 45 cm newtonian, and in order to check the optical axis condition,
I took a image of the entire sun with an eccentric diaphragm with a diameter of 17 cm + a solar filter.
You can see the sunspots, and the solar activity will be revived! , Daytime imaging is hot and hard!
