77mm ND Variable Neutral Density Filter for Canon EF 24-105mm f/3.5-5.6 is STM Lens - Walmart.com
Drop-in Variable ND Filter A - Allen's Camera
NDT Fusion Auto Adapter - Canon EF Lens to Fuji X Cameras w/ Variable ND – Fotodiox, Inc. USA
Haida Rear Lens ND Filter Kit for Select Canon EF Lenses HD4568
Amazon.com : JJC 49mm Variable Neutral Density Filter ND2 to ND400, Slim Fader ND Filter for Canon EOS M6, M6 Mark II, M5, M50, M50 Mark II, M200 with Canon EF-M 15-45mm
Canon Drop-In Filter Mount Adapter EF-EOS R 3443C002 B&H Photo
Canon Drop-In Variable ND Filter A (1.5-9 Stop) 3446C001 B&H
NDT Fusion Auto Adapter - Canon EF Lens to Fuji X Cameras w/ Variable ND – Fotodiox, Inc. USA
Amazon.com : 77mm Variable Neutral Density Filter for Canon EF 100–400mm f/4.5–5.6L Lens : Electronics
49mm Adjustable ND Filter ND2-400 Neutral Density for Canon EF 50mm 1.8 STM Lens | eBay
New CANON Drop-in Variable ND Filter A for Drop-In Filter Mount Adapt. EF-EOS R | eBay
Amazon.com : 58mm ND Variable Neutral Density Filter for Canon EF-S 18-55mm f/4-5.6 is STM Lens : Electronics
Amazon.com : JJC 58mm ND Filter ND2-2000 VND Variable Neutral Density Adjustable Fader for Canon EOS Rebel T7 T6 T8i T7i T6i T6s T5i SL3 90D 80D with EF-S 18-55mm Kit Lens