Amazon.com : 72mm Variable Neutral Density NDX Filter for Tamron SP AF 17-50mm f/2.8 XR Di-II VC LD : Electronics
New Kipon EF to E-mount electronic adapter with variable ND filter is in Stock at Adorama and Amazon US/DE - sonyalpharumors
Pin by Kalon Productions on Generic Wish List | Filters, Variables, Camera filters
Best variable ND filter in 2022 - Camera Jabber
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 : Electronics