Hi all,
I wanted to buy my first narrowband filter. I decided on a 7nm Ha filter. Among the options, there were the Baader 7nm and the Optolong 7nm. I chose the Optolong even though I heard that the colour ones are Astronomik copies. However, I searched some comparisons between the Baader and the Optolong and the Baader seemed to have some halos. I decided on the Optolong. However, I don't have a proper imaging camera and for a while I'll be testing it with the ASI120MM I have. Plans for a larger sensor camera.
Yesterday I received the filter and had some tries on M42. My balcony window opens to NEE so M42 is a tough target. I can only point the scope to it on EQ mode only before it reaches 15deg. So I had to switch to AZ mode where a scope can reach almost out of the balcony with the counterweight bar extended. Very good AP setup.
Anyway, I attached the ASI120MM to a Tair3s lens, wide open this time at F/4.5 and put them on the AZ-EQ5 in AZ mode.
~40x10s + 70x2s. Gain 70/100. With calibration files.
I don't know what to try this evening if it's clear. What do you think about putting the camera on a 135 F/2.8 lens and drizzling 2x? Did anyone of you try drizzling and had a successful result?
Clear skies,
Alex
Edit: I don't know what I've done to have the white frame, I didn't notice it until now. It was probably after combining the 10s image with the 2s one.