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I realise that a doublet will have "some" CA still, but my little Kson ED80 is a doublet at F5.5 also, like the Long Perng, and it's colour correction while not perfect is far better than the LP. That's why I went for the LP, I thought it would be in the same class as they are both F5.5. I believe the Kson uses a FPL51 glass element.
Kson ED80 pic for comparison.
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