Fastcast lenses

Hello all
I have been tasked with writing an article on ‘Fastcast’ lenses. Recently had the misfortune to see some with really awful lens aberrations. I am not familiar with the process at all and Dr Google is proving to be less than helpful. The labs I have spoken to are not willing or able to share info. I am based in South Africa and would really appreciate some useful input please.
Many thanks
Cheryl

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