Hallo Tom,
danke für den Hinweis. Dass ocal der Hersteller des Kollimators ist, ist der Forumsleitung bereits bekannt. Es gibt mittlerweile auch einen offiziellen Importeur für den Ocal Collimator (Nocturec). Das Thema hat sich somit erledigt. Falls jemand über das Gerät diskutieren möchte, bleibt dieser Thread aber offen.
Bis dann:
Marcus
Da dieser Thread sich zuletzt doch nur um den OCAL-Kollimator gedreht hat, verschiebe ich ihn doch mal zum Marktgeschehen.
This thread has turned into a discussion about the OCAL-Collimator lately, so I'm moving it to the market section of the Astrotreff.
If you think this post is inappropriate in this place, I ask the administrator to delete this post
No, it doesn't mean that at all. I neccessary we'll move this tread to another place in the board, but it does not have to be closed or even deleted.
You can leave the commercial aspects of this thread to the mods. We'll be in touch.
In the meantime you can keep on discussing about collimation. We're in no hurry here. 
Greetings:
Marcus
Hello ocal,
the collimation in the last picture looks very good. The very last step would be star-checking on a medium-bright star. Polaris is quite perfect for this. Look at the star with an eyepiece and your highest possible magnification near the perfect focus. When going though the focus with your focusser the, „donut“ (the picture of the aperture with the secondary mirror and it‘s holders) should collapse into the airy disc and unfold again perfectly on the other side of the focus position.
If the donut develops some kind of tail while going though the focus, your alignment is not perfect. If the donut is elliptic and the orientation of the ellipse turns 90º inside and outside of the focus, you have astigmatism in your system.
See you:
Marcus
