This 58mm variable ND2-400 filter allows for light adjustment. It's a 58mm ND filter, but since it's variable, the filter cap is 62mm, so I'll include that as well! Used a few times with an EF50F1.8, the lens is scratch-free and in excellent condition. - Model: NANO-B 58mm - Type: Variable ND Filter - ND Value: ND2-400 - Included: Microfiber cleaning cloth (5 sheets) - Cap: Filter cap Thank you for looking.