Well, I got curious and went down a bit of a rabbit hole. But, it stated ED element is S-FPL51. In a doublet there will be some purple fringing on the bright stuff. For visual should be fine actually. You would probably want a triplet for AP.
If you too want to go down a glass type rabbit hole, this thread below should keep you occupied for... oh at least half an hour.
https://www.cloudynights.com/topic/5...-fpl-51-glass/