Brian, Andrea,

When I rotate the eyepiece the distortion's orientation does not change. I
suspect also that the focuser needs some fine adjustment. I'll give it a
last try, however, at magnifications above 100X the distortion is gone so I
won't fuss with it too much. I'll have some clear skies tomorrow so will
post again late tomorrow night.

Thanks for the replies.

Dan

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Brian Tung wrote:
Dan wrote:
I did try that as well as used other EPs but nothing changed.

I assume you mean that the pattern stayed in place, rather than rotating
with the eyepiece, right?

Maybe I'm not reading Andrea right, but I don't see why that should
happen when the star is in the center of the field, and I particularly
don't see why the magnification should matter, if the eyepieces aren't
at fault.


Because most likely than not at low power (and possibly large FOV) the
center of the ray bundle isn't exactly at the center of the EP (which
is difficult to estimate anyway) . However it is is the high power that
matters and if the secondary were off-center than this would affect
also the high power views, IMO.

Andrea T.