As I understand it, that Smallrig matte box can't be used with Bob's Fuji lens. His lens has a 52mm thread. The Smallrig matte box requires a lens with a filter thread that's 67mm, 72, 77, 82, 92 or, with an optional adapter, 95mm. It's possible to mount the matte box on rails instead of on the lens, but I'm unaware of a practical way to do that with a large format camera. I suppose that Bob could try using a 52mm to 67mm step-up ring and see what happens. The matte box isn't light. It apparently weighs 457g (1lb), plus the weight of the 100x100 or 100x5.65 filter or filters that are used with it. As Kiwi says, the required filters are 4mm thick.
As far as I can tell, the matte box will only take square polarisers. Can the matte box be rotated?
There are B&H customer comments that express concern about quality of construction and loading and unloading filters. This matte box doesn't have filter trays, which exposes filters to being scratched.
I recognise that you're using gels instead of glass filters, and that this might address some concerns. However, gels limit filtration, excluding for example Bob's graduated ND filters, and note that Bob says in his first post that he prefers glass.
Amusing how people react differently to tools. I started using Lee100 with my Blackmagic camera precisely to get away from the hassle and cost of using a matte box
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