The lens hood/matte box is about 8-1/2 inches wide at the front. In this photo, it is expanded almost to its full depth, and guess what: At the fill wide angle of the lens, there is zero vignetting. Nada. Zip. Zero. Pretty cool.
The Lee Filters Wide Angle Lens Hood makes the XH A1 look a lot bigger than it really is, but it's not nearly as unwieldy as a traditional matte box with support rails. Not nearly as heavy either.
The weight is only 6 ounces, and 72mm wide angle adapter probably adds another ounce or two, so the whole thing is about half a pound. It really doesn't seem too noticeable when hand-holding the already nose-heavy XH A1. I'm accustomed to holding this camera much as I do a still camera, with my left hand around the lens, propping up the camera with a couple of fingers under the base of the lens hood. That makes for the steadiest shooting.
The hood comes with two 2 mm filter slots standard, and they rotate, so a circular polarizer is useable. The 2mm slots are sized for resin filters. To use 4 mm glass filters, I bought, for approximately $20 more, two 4 mm slots. The slots are held in place with small brass screws. Take them out, replace the slots and put in the longer screws that came with the fatter slots. So, I can use lighter weight, and much, much cheaper resin filters, or go with glass.
I haven't used non-glass filters in years, but today's resin filters (at least the good ones from Lee Filters and Hitech, both British companies) are made of the same stuff as eyeglasses. I bought an ND.3 to check out. I guess I was expecting a thin pliable piece of plastic, but it's solid, doesn't bend, and feels like glass. The only way you can tell it's not glass is to look at the edges. Good quality resin filters should be optically as good as glass for most everybody's purposes. If you're a Hollywood cinematographer, maybe you can measure the difference if you have sensitive instrumentation. The downside to resin filters is that they're more easily scratched, so it takes extra care in cleaning. Lee Filters sells a cloth and fluid that allegedly won't harm them.
The Lee Filters Wide Angle Lens hood from the side. It clips over the 72 mm wide angle attachment, which is almost impossible to see in this photo. The housing behind the bellows with the screws is the filter holder part of the hood. If you squint and look carefully just to the left of the writing on the lens, you can see a slight glare. That's all that shows of the adapter. The arrangement is very clever and positions the hood right up close to the lens so there's no chance of vignetting. Even extended as far as it is in this photo, there is no vignetting at my full wide angle.
