The Skywatcher guy on CN says the glass is not FPL-53:
"The glass they list is incorrect. We are using a proprietary glass combo to make these. Optics were designed by the same optical engineer that designed our Esprit triplets.
Now don’t let this whole glass thing scare you off. The color correction diagrams looks very good. It is my main concern to make sure the scope performs well and well corrected. I will know more once my samples arrived to me. "
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