I would say that it's irrelevant. What kind of filters do you normally use? A circular polarizer? That's not going to work with this lens. The only thing I can see someone using on this lens would be some kind of neutral density filter. Practically anything else you can do in post.
5D Mk III, Elan 7e, Nikon J1, some old rangefinders
Tamron 24-70 2.8 VC, 70-200 f/2.8L IS II, 400mm f/2.8L II, Sigma 85mm, 50mm, & 35mm f/1.4's, Rokinon 14mm f/2.8, Canon 2x Extender II, Kenko 1.4x, 430 EX II, Elinchroms