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TSA line is ONLY 120 now - the 102 has been out of production a few years now, replaced - oddly - with the FC-100 (not a wise Tak choice to cancel the 102 IMHO, as it was THE best 4" scope I have ever owned or used). I expect the FC-100 sells better, being considerably cheaper than the 102 ever was.
The design of the TSA is pure triplet, whereas the TOA is well-spaced triplet. The new fluorite FOA shares the same design principle, and is one of the highest Strehl production scopes ever made (it's for all intents and purposes a poly-Strehl of 0.995)
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