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Thanks Gents, I have taken the advice onboard. I have found a new TMB Planetary Type II (9mm) for sale on ebay so I have gone with that for now. I already have good eye relief from my GSO Superviews in 30 and 15mm, and this TMB should be a good addition to the collection. As to 6mm I will probably park that for now as I can't afford the cost of the good ones.
Can I ask one other question, what are the views on the use of 2x Barlow tubes with these EPs, and are they all the same? I have a Celestron 2x Barlow that came with my old Celestron 130 but when used on the 12" Dob it doesn't seem to be very impressive compared to the differences that the change to a good EP made.
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