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It is largely semantic argument, and it is dubious to call those glasses anything in 'ordinary' terms, but FPL is in fact more 'crown' than 'flint', so in that view late Thomas was right.
But both Fluorite and FPL53 are much farther from "normal" glass line than KzFS-1 (hence better color correction/spherochromatism possible).
BTW, Fluorite has higher homogenity than ANY produced glass. If there was H10, it would be called that. The Russian OK4 would be very similar.
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