I got a very interesting answer from Ohara: they said that all Chinese manufacturer don't use their S-FPL53 glass.
I want to highlight the fact that the FPL53 does not exist, the real designation from Ohara is S-FPL53 (check on their website).
If a shop will says that their telescope uses the FPL53 glass, this is controversial but being just a code, it is hard to argue.
If you will read that the telescope use a FPL53 glass by Ohara, that is most likely false. Probably many shops write that in good faith and they logically think that the glass is from Ohara but it is not like this.
Companies that use the S-FPL53 glass from Ohara are:
Zeiss, Leica, Thales Angenieux, Canon, Panasonic, Olympus
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