Thanks for the comments Greg !
I tried to stop down to 5.6 with the built in aperture, but gave uggly result with rays around bright stars. Much better with a rebuilt filter with a hole as you say. But for the moment I feel this is good enough and it will be a bit better when I'm more used with the lens.
I have a Red dot finder, Haven't used it much yet, but now there is a need of it. I mount it on the mount and then it's always there when I change lenses. One problem, I have built the tripod very low to have it more stable and more transportable. Then it's difficult to see through the finder. Maybe a 90 degree mirror can be applied.
I added a map with asteroides:
https://www.astroshop.eu/red-dot-pro...sonian/p,47445
Maybe there is one in the photo.
/Lars