Keldan SF 2 or 4 i.c.w. GH5

I'm switching with my GH5 setup to a Tokina wide angle. This make that my 62mm Keldan SF-4 does not work anymore.

The question is: do I go for a SF-2 or a SF-4 in this combination since the GH5 is not that light sensitive and it is a very wide angle lens.

Does somebody have any experience with this combination?

I would advice to contact Keldan directly. Daniel uses a GH5, he probably knows best

Thanks I just did. But I'm still wandering if there is somebody out there who uses a GH5 in combination with a Tokina 11-16

The GH5 takes a -2 filter irrespective of lens. More is for largers sensors with higher base ISO i.e. Sony A7S3