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Hi there
I own 17mm t4 and find it very good indeed.
Word of warning here - it is a very heavy 2" eyepiece and if your collection of eyepieces are mostly 1 1/4 you will have a balancing problem not to mention the need to use 2 - 1 1/4 reducer. The eyepiece has field lens (the one on the bottom of the T4 facing the telescope) so close to the edge of the 2" skirt I am always afraid I will damage it. As a result I find myself using the eyepiece less. I think the eyepiece is too heavy, too easily damaged and too expensive.
Joe
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