Greetings, I'm considering the purchase of the 72XL. For those who have & use this lens, co uld you please advise me as to whether you use the Schneider center filter desig ned for this lens? Does it allow for adding on a larger filter (105mm?110mm?)for B&W photography? Or, can I use another brand (B+W, for example), with a step-up ring/slim filters? Your suggestions are appreciated. Thanks, BILL
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