77mm is considered the "standard" for pro sized lenses, but they are pricey. There are larger elements, as well, though typically, when a lens front element starts getting much larger, the manufacturer uses rear "drop in" filters that you insert at the rear of the lens by the body. This prevents the cost of buying gigantic filters every time.
For ND's, the Cokin method is enjoyed by many, simply because they are so nice to adjust and move to where you want them as compared to a screw-in type, which is set and dictates your composition.
I use a Hoya myself, and find it works very well. There was some discussion about polarizers over here not long ago. |
