Drop-in Filters PL-C can be rotated from the outside without removing them from the lens for precise control.
Compatible with: EF 300 f/2.8L, ISII, 400 f/2.8L IS II
Reviewed by 3 customers
Used with Canon 400 DO. Easy to load and use. Performed as expected. Pricey.
It is what it was designed to do with a minimum of fuss.
costs a bit more but fits and works well