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Sounds like a good setup Ray. I'm currently trying to get some spec's on prism size, as I think a larger prism is better suited for this focal length. I'm leaning towards the Orion "Thin Off Axis Guider", but the helical focuser on the Celestron sounds good. ZWO also have a standalone helical focuser, but whether that would be compatible with the Orion is still something I need to check out.
My setup is/will be: Baader focuser - OAG - ZWO EFW - ASI290MM. I need to do some measuring or find some specs for the distance from prism to 290MM sensor, then I can decide whether I need a helical focuser for the guide camera. I think budget will limit me to the ASI120MM-mini.
Last edited by morls; 05-09-2020 at 10:39 PM.
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