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As I understand it both are triplet air-spaced APO's using FPL-53 low dispersion flourite glass in the objective. The TOA has a slightly longer focal length (7.7 v 7) which might help slightly with CA but at the cost of a longer tube and less suitability for photography.
What differences do you think might exist that contribute to one being in a totally different class? I know Takahashi have the long reputation but to get a large difference in quality you would need either a significantly better design, better components or better assembly.
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