Is there any good solution to mounting square filters to a 47mm Schneider SA-XL? The considerations are to mount with and without a center filter in place. My filter investment is in the Lee 100mm system. My camera is a Canham DLC 45 w/ Technika mount. Lee makes a 67mm wide angle adapter for their holder which migh t cover the situation if your working without a center filter. Will the filter holder vignette the image? I believe the accessory thread on the center filters are 86mm. Lee doesn't make any adapter for this size, and even if they did, I still wonder if vignetting would be a major issue.