Yes, no other accessories needed. The filter can be directly screwed on your camera lens. 

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EOS-FX,You can use Canon EOS EF / EFS Lens on a Fujifilm FX Mount Camera body,, Your canon ef 75-300 1:4-5.6 is canon EF mount lens and fuji x-a3 is X mount camera body. so the adapter ring fit for your camera and lens. but pls notice, your lens is telephoto lens,we do suggest you could use one telephoto lens bracket that could be attached to the tripod to increase its stability. because the canon lens could not adjust aperture,so suing our adapter ring could not adjust aperture 

Good evening, Yes the adaptor wil work very well. You have to set the camera manually to shoot. Please note the camera must first be set to manual with the original lens attached,it's impossible to access the shooting menu without this lens. Exposure will be trial and error but I think you will find the results worthwhile especially I mono, Regards 

I use this to mount an m42 zenit mirror lens to an EIS R, so it should work for your m42 lens. You will have to change the settings to allow release shutter without lens as there are no data pins on m42 lenses.