Hi Guys, I'm looking to try out some filters and was wondering what my best option would be. I've pretty much decided on going for the Formatt-Hitech system but I'm torn between 67mm and 85mm. I'm only interested in mu43 and will be sticking to native glass. I'm planning on swapping my P14-45 for Oly's 12-40/2.8 next year which I believe has a 62mm thread. I could possibly see myself with a 9-18 at sometime in the future. Will vignetting be an issue? I'm guessing the 85mm is more future proof but more than twice the price of the 67mm, which is also more compact which is a big draw of mu43. I'm tempted by a couple of deals for the 67mm as for under £100 I can get a decent set up, starter set, 62mm ring and six NDs 3 plain and 3 hard grad. If it's something that doesn't hold my interest then it's no great loss. Cheers.