Astroscan
Hi Roger, I had the Astroscan in the late 80s and regrettably sold it when aperture fever struck,but remember many memorable views through it and the supplied Edmund 28mm Kellner(an interesting eyepiece in its own right).
The field of view was about 3 degrees,and the view showed coma(as it would for a fast mirror) towards the outer third of the view, but the image was bright and was great on star clusters,Nebula and the Milky way ,for which it was primarily intended for.
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