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Originally Posted by Lester
Like the colour variation in the Nebula.
Is the WO ZS66 SD a APO? Star Images are very good corner to corner.
What f ratio is the scope?
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Lester,
It is an F5.9 Semi APO, see here:
http://www.william-optics.com/wowebs...ifications.htm
There are three similar models, a Petzval ED semi, the one I have and an ED Triplet APO.
And I cropped out the outer 25% of the image where the field curvature started to be noticeable - I should have said that in my notes.
There is a review of this family in the May Sky and Telescope, so far my view is 100% positive...