This lens has the tendency to flip nose up when mounted on unpowered camera. 37mm Variable ND filter by Promaster's (Promaster 37mm Variable ND Filter) seems to be a perfect solution, adding 13.7 G on front. Moreover, generous ND3 to ND400 density range will deliver in most extreme situations. However, although circular ring moves smoothly the way polarizing filters do, attention must be paid maintaining the excess of silicone lubricant to avoid dust contamination.