I have a question regarding filter sizing for the Schneider 47mm XL lens. I've placed an order for this lens, to use on my Arca 6x9 F-line camera. I will use this lens on the 6x7 film format, my choice for filter sizing is as follows: I' ve decided to use this lens with a 67-77mm filter step-up ring, the intention is to avoid lens vignetting caused by multiple filters. I primarily shoot black a nd white film and on occasion, stack two filters. Since most wide angle filters delete the front mounting treads stacking filters is not possible. My question is this; Will my preemtive strike of stepping-up to a 77mm filter in lieu of the standard 67mm filter, prevent vignetting caused by two filters being installed on this lens??? Thanks for the input. Bob P.