EdgeHD 8 Collimation

[javaruba]

Hi folks,

I've been seeing tear drop shape stars with the EdgeHd 8 and ZWO ASI294MC Pro camera, so I verified the collimation. I'm using a celestron x0.7 reducer.

Does collimation needs to be checked  with an eyepiece or with the camera and with or without reducer? I'm asking since I verified my collimation yesterday and couldn't see the concentric rings with the complete imaging train (ASI294MC, OAG, and x0.7 reducer). It was only showing the inner shadow and outer circle. I than  replaced the AS294MC with my guide cam (ASI120) which has a much smaller sensor and could see many rings. While, to my view, it seems to be collimated, it's strange that I can't see the rings with the main imaging cam. Any thoughts? Here's how I left the collimation after some adjustments with the guide cam.

Kind regards,

Jairo

[knobby]

Looks good, I'd check it with and without the reducer to be safe. In theory you should be able to check it with camera or eyepiece so long as fairly high magnification.

[newbie alert]

Metaguide does a collimation procedure,  it might not agree with  the doughnut,  but you can check stars right at the edges rather than one in the center of the frame

[KGX]

All I can add is that the collimation photo makes me happy. Nice work.

Contemplating the x0.7 reducer for my EdgeHD 8 too.