1-stop ND filter:
2-stop ND filter:
3-stop ND filter:
4-stop ND filter:
9-stop ND filter:
Graduated ND filter: (These are just about useless in a threaded frame as it forces you to put the graduated portion across the center of the image no matter where you rotate it.... don't bother buying one of these!)
If you want to get a Grad ND, get the square kind... you can adjust them to cover any portion of the scene you want. They come in two flavors (in addition to various stops): Hard-edge:
and soft edge:
... the difference being how gradual the change is.
One other ND filter is available, the Variable ND filter:
It allows several stops of filtering in one. Typically 2-8 stops. These can get pricey, so most people who get one buy one that fits the largest filter they need, and use reducing rings for lenses with smaller filter threads.

2-stop ND filter:

3-stop ND filter:

4-stop ND filter:

9-stop ND filter:

Graduated ND filter: (These are just about useless in a threaded frame as it forces you to put the graduated portion across the center of the image no matter where you rotate it.... don't bother buying one of these!)

If you want to get a Grad ND, get the square kind... you can adjust them to cover any portion of the scene you want. They come in two flavors (in addition to various stops): Hard-edge:

and soft edge:

... the difference being how gradual the change is.
One other ND filter is available, the Variable ND filter:

It allows several stops of filtering in one. Typically 2-8 stops. These can get pricey, so most people who get one buy one that fits the largest filter they need, and use reducing rings for lenses with smaller filter threads.
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