The 100 degree E.S. is the clone of the Ethos. X ray photos of both show the exact matching config. of lenses the performance is Identical. I find the 9mm and 13mm E.S. is superb at half the cost of TV. THE 82 DEGREE I HAVE USED AND ARE EXCELLENT But the 100 degree make all others redundant including my 17mm t4 TV which I never thought could happen - Bevan
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