I just started shooting 5x7 and have run into questions I never considered before. One is the use of center filters for lenses that did not require them in 4x5. While I never had a need for center filter with for example 90XL or 110XL in 4x5 the fall off is more noticeable with larger formats. The filter IVb for 72xl has an outer filter ring of 112 so I need to look for at least a yellow in that size. Any other options? I assume I can’t mount the yellow filter between the center and the lens.