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Colin,
Many thanks for your comments. My Dob moves smoothly enough and the Finderscope is aligned as well as possible.
I have experimented with different "eye relief" combinations through Stellarium but, in real life, can only play with my 25mm and 10mm ep's.
So that I see more of the sky I have been thinking about upgrading to the wider field of view available through a 2" ep.
Erick,
Your preference(?) for a range of 2" ep's (rather than 1.25") prompted my question.
I will study the Televue link in due course.
Thanks for your help.
Peter
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