Filter confusion

After doing some maintenance in my backyard observatory (collimation etc.) I noticed a confusion… my Ha filter was not in the filter wheel, but in it’s case 😉

Now it’s corrected. Here is a short comparison between IDAS V4 (confused with Ha) and the „real“ H-Alpha 13nm. Same exposure duration and background  adjusted to same level.


Astronomik Ha 13nm / 450 seconds
IDAS LPS V4 / 450 seconds