Fuji GX617 Center Filter?

Hi, I am looking at a used Fuji GX617 with the 105mm lens. I am looking for info from the group here if the center filter is required for the 105 lens? Also, if you are a GX617 user/owner, if you have any thoughts about the camera and your experience, I would love to know them.

Thank You!

If you're shooting E6, you'll need it.

what filter thread size ?

I shoot with a Linhof 617 and almost prefer the 90mm without the center filter. I guess it's a matter of taste, but I like a little vignette.

Not a GX, but I shoot 617s with a Fujinon SWD 90mm.
On Velvia 50, there's a little bit of vignetting, but really nothing that's offensive, I can live without a centre filter most of the time.
That said, I do have a centre filter for it, a Schneider IV that works perfectly.
So if you've got a 105mm, the effect is only going to be less noticeable than at 90mm. I'd say try without it, then get one later if you really don't like the vignetting.

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I've never bothered with center filters, except once - and I regretted the purchase as it wasnt worth the money for me...