This lens is for a medium format camera and is not compatible with the XT3. The XT3 takes X mount lenses.

The FUJIFILM GF 50mm f/3.5 R LM WR Lens uses a 62mm filter thread. And you can add that size filter to the lens. The hood that the lens comes with can screw into a filter that has that has a front thread. but you might get some vignette when using it with a filter. This is is some good polarizing filter options, https://bhpho.to/3CTCVqU

There is a sunshade included which will protect the lens. jim trotter

Probably not

The FUJIFILM GF 50mm f/3.5 R LM WR Lens has a metal filter thread.

The FUJIFILM GF 50mm f/3.5 R LM WR Len works with CPL Filters that are 62mm thread. If the CPL has a 62mm front thread you can use the hood.

The aperture of the FUJIFILM GF 50mm f/3.5 R LM WR is the same as for any 50mm f/3.5 lens--it's a ratio of focal length to effective aperture diameter, so there is no difference between different formats, only different focal lengths.

As mentioned previously, there is a small metal hood included which screws on to the front of the lens and has its own 43mm lens cap. Worth mentioning, if youre going to use basic filters that do not have threading for filter stacking, you cannot use the hood at the same time. Having said that, I personally have not felt the need to use the hood over the 2 years Ive owned this lens. The optical coatings and element design with the small entrance pupil do quite a bit to eliminate flare and ghosting. I have several photos with the sun directly in the frame, and there are no that I can directly attribute to the lens. (Prismatic reflections off of the image sensors color filter array are occasionally present, but thats a problem for all digital cameras and not specific to Fujifilm or this lens.) I hope this helps.