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Jason the TS60 version seems to feature a Doublet of both FPL-53 and Lanthanum glass elements (not just a Lanthanum coating). The others do feature one element of FPL-53 but don''t mention the composition of the second element. That might explain the price difference. There is no doubt they all come from the same factory, but TS does make a point, in their Details pages of many of their refractors, that they specify high end objects where they can source them.
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