[raymo]

First, Robert, the mount problems last night were the last straw; it has now officially gone bananas, did one iteration o.k. and after the second one it said I was 23 degs off in Az and 9 degs in Alt. Gave up and did a rough drift align which got me 110 sec subs with this lens.
I have a huge dew shield for the Newt, but not yet for this little lens, must fabricate something for it.

Thanks for the info Glen, I'll have a look at it.

Thanks Dunk, with better P.A.I'll go for longer subs.
raymo