Variable ND Filters

I finally picked up a decent polarizer and now I'm looking for some nd filters to complete my set-up. I noticed that B&W makes a variable ND. Has anyone had any experience with these? I like B&W the pola I bought is made by them so I'm satisfied the quality of the product is good but I'm wondering about how they work and do they have any drawbacks. Thinking I could save a little money and with the set of step down rings I have I'd have all my lenses covered with a pola and ND with two filters. Picked up the pola mainly to knock the shine off blacktop and cut the glare on the cars I shoot. Tested it out on some very bleached out road near my house and it does just what I wanted. Would have come in handy at the drag boat races last weekend as well. They just announced the dates for the Vintage Nationals at COTA. Last year was awesome. Over 500 vintage racers. The pit walk was like a living history book. Even some Morgan 3 wheeler racers were there. No assigned seating you can roam freely. Great for photography.



Griz