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I just bought the Sigma 18-35 and need to add a new ND filter for it, so I'm re-hashing this (relatively) old thread. I was about to buy the Tiffen 72mm variable ND, but after some sniffing around I noticed a review comparing it to the SLR Magic variable ND (https://vimeo.com/125507165). By comparison the Tiffen has a very strong "haze" to it. I also saw some info on the Syrp variable ND. Has anyone used either of these?
BTW, I understand the issues others have mentioned with variable ND filters, but I am often on shoots that don't allow time for single ND filters. In most situations I can avoid the issues of variable ND filters, and feel the compromise is better than missing a shot.