Hey everybody! I just ordered a 14mm pancake and the 25mm panasonic/leica lens. I'm looking to pick up some ND filters and was wondering if anyone has had any vignetting problems with stacking filters. I'm looking to get a 10 stop B&W, but I'm also thinking about possibly two 0.9 filters, or possibly a 0.6 and a 0.9. giving me some options. I was going to go with a variable filter, but most seem to have crap reviews. So, my question is, anyone successfully (or unsuccessfully) stack 2 or possibly even 3 filters without side-effects on either of these lenses? Thanks!