Other than the UV filters and the polarizer, I don't think Leitz is currently selling any lens filters. I am looking for some chrome-ring 39mm filters for B&W work. Are the old original Leica filters up to modern standards, coated, etc.? Or shall I get a modern filter from the current manufacturers? I regularly see vintage Leica filters on eBay and they are sometimes bit up to stratospheric prices, depending on color. Any recommendations, tips?