Canon 50mm 1.2L 'Protection' Filter?

I know this is going to sound like a really daft question, but I have just bought a Canon 50mm 1.2L and don't know what protection filter to buy for it. There are so many!

I usually don't like using any protection on my lenses, as I want it to be as it left the factory, however looking at the front of it, it looks like it has a stupid design that is going to be susceptible to dirt and moisture ingress.

Therefore, any recommendations on a decent 72mm filter to use to protect/seal the front of the lens that won't affect the image in any way?

.

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