Rent a Tiffen 52mm Variable ND Filter at LensProToGo.com
Amazon.com : K&F Concept 52mm Variable ND Filter ND2-ND32 Camera Lens Filter (1-5 Stops) No X Cross HD Neutral Density Filter with 28 Multi-Layer Coatings Waterproof (Nano-X Series) : Electronics
Amazon.com : K&F Concept 52mm Variable ND2-ND400 ND Lens Filter (1-9 Stops) for Camera Lens, Adjustable Neutral Density Filter with Microfiber Cleaning Cloth (B-Series) : Electronics
Moment 52mm VND 6-9 Stop (600-097) - Moment
52mm Bullet Optics Variable HD Multi-Coated Neutral Density (ND) Filter for Canon EF 28mm f/2.8 Lens - Walmart.com