Has anyone tested these pancake lenses?
Here you can find some modern pancake lenses: https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.digitalcameraworld.com/buying-guides/the-best-pancake-lenses&ved=2ahUKEwi1wc_9_9n1AhWEiP0HHbF9D1MQFnoECDQQAQ&usg=AOvVaw1lhGHBqpxDFjKAQ4DNdKYz
Some have only one cemented group, and one of them, the Sony E 20 mm f/2.8 has none, as previously mentioned. If the cement used in modern lenses is one of the causes for the poor UV reach, then these lenses could,
I actually disagree with this - potentially the more you correct for aberrations in one part of the spectrum, the worse you make it everywhere else. That's just generally what happens when you try to optimize something at a particular operating point in any kind of machine, not just lenses.