Hi,

I attached a ZWO ASI 120MM-C to a William Optics Spacecat (F4.9) with a 40 mm extension tube in between. The Spacecat has 77.7 mm back focus, excluding 24 mm of rings behind the point indicated in a diagram, and the sensor sits 12.5 mm inside the camera, so I thought I could compensate for the remaining 1,2 mm by adjusting the focus on the Spacecat.

diagram.jpg

However, when I turn on Ekos during daylight, all I see is a white image, which turns dark when I cover the lens with my hand. At night it is completely black, no matter how I adjust the focus.

Did I understand this wrong, or do I need to change some settings in Ekos?

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