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Hi Wilso,
I have the TSA102, and I use the TV 3-6mm Nagler for high power views. I have the TV 2x barlow as well, but it isn't needed with this eyepiece. It works really well with my 13mm Nagler though. The TV Powermate barlows are as I understand optimised for AP, and the "normal" TV 2x and 3x are ideal for visual use.
So, my question is do you really need the Tak extender (which is great for AP) when a much cheaper but still top quality barlow, or a good quality short FL eyepiece will work nicely for high power visual use? If you want the sharpest high power views, what about getting one of the Tak Abbe orthos, or a couple of the Fujiyama orthos?
Just a thought...
All the best,
Dean
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