Which filter manufacturers make graduated ND fitlers large enough so that they can be used with large (95mm diameter filter size) lenses? It has to be significantly larger than 4x4 since the horizon often occurs at the top of the image rather than the center (so a round, screw-on filter won't be so useful). The largest ones I know of are by Lee (4x6).
Sinar makes a series of 3 graduated ND filters to fit their holder: a 0.3 ND, 0. 6 ND, and a 0.9 ND. These are very neutral filters that start off feathered and get gradually darker until you are about half way up through the filtered area. They are either 1mm 0r 1.5mm thick (I forget) and are bought individually. From experience, the more you stop down the hard the swifter the gradation comes into play. Now the hard part: eac h filter is probably US$125-150, the holder, a three slot design that comes with three snap together lens shade rings that snap into their own fitting at the fr ont of the holder, is about US$200.00, and the adapter ring to connect your lens to the holder is about US$55.00. I have had mine for awhile, so I may be off on the prices. Call Sinar and ask for a catalog. Also check with a company called Visual Departures about the very similar line of filters they distribute.
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