I was nearly one year since the last time I use my 300 mm solar telescope.
Last Saturday morning, the conditions were not very promising. The wind came from Nord-West, which usually is not good for the seeing. And the sky was coronal, which is not good either. On top of that there was not a single spot or even a small pore in view.
Having re-collimated the scope during the previous night, I decided to give it a try anyway just to check my collimation on the Sun.
I started with a red filter (656 nm), then switch to a green filter (540 nm), to a blue/green filter (500 nm) and finally to the 430 nm (G band filter).
Accordingly, this sequence shows the increase of contrast and resolution when going from red to violet light.
Here are the images.
Red light (656 nm), the contrast is prety low, but this filter is less sensitive to the seeing :
Green light (540 nm), the contrast is much better :
Green/blue light (500 nm), the contrast and resolution are still better. Usually, this is the optimal filter for my place :
G band (430 nm). This one is a different world since the intergranular bright spots and filigrees become visible. This is the first time ever I have these seeing conditions at my place :-)
Best regards
Christian Viladrich
