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I am not testing or comparing either of the eyepiece's....My scope is sold and I promised the buyer I would not use the scope or the eyepiece anymore......The 20mm is a replacement for the 26mm series 4000 I sold months ago....
The adjustable eyeguard is great even a better system then Nagler's T4 series.....it's a twist action that revolve's up and down the 1.25 shaft as you twist the eyepiece...very solid feel.
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