eyepiece projection with my ASI 178MC

Focusers, Filters, Barlows etc..

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eyepiece projection with my ASI 178MC

Post by FlyingAce » Wed Feb 26, 2020 2:00 pm


Having a Skywatcher 200 PDS, I am trying to capture picture using my new ASI 178MC camera and an hyperion baader eyepiece (13mm).
It seems I have a focus issue.
For the first try, I had the camera moonted directly on the eyepiece using only the adapter. I was not able to do focus on the moon.
For my second try, I had inserted an extension ring (40mm) between the camera and the eyepiece. The moon was not there, so I had try on beehive cluster, but I had nothing but black picture (removing the camera what I can see thru the eyepiece is wondeful).
Do I need to add another extension ? or 40mm is too much ? What is the correct distance I need between this camera and my eyepiece ?

Thanks in advance.

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Joined: Fri Dec 07, 2018 10:24 am

Re: eyepiece projection with my ASI 178MC

Post by Support1@ZWO » Thu Feb 27, 2020 2:02 am

You may find out the distance by the spec given by manufactures.
And then arrange the back focus.

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