With that extreme field-of-view, that's a clear no. Maybe a rear filter slot, but that would also compromise the optical design a bit.Would the R mount allow for a 10-24mm f/4L USM *with* front filter thread? One can dream.
It will need a special filter kit, but it does not need to be quite as enormous as it was with the 11-24mm.
One advantage the old 11-24mm has over the RF lens is the EF adapters with built-in filters.
Of course there have been DIY attempts at putting a filter on the Sony 12-24mm lens, but it will only work for 14mm onwards.
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