What kind of ND filter should I buy, how much?

Question

I'm taking a trip to Florida in July and I need the scoup on neutral density filters. I have a Nikon D80 w/18-135mm f/3.5-5.6 lens and I want to shoot great sunsets on the beach, and I hear tell of how well [some] ND filters work. But I am totally befuddled on which type to buy. Sure, I could get a ND .6 graduate that will screw on to the lens, like a circular polarizer, but the problem is with where the graduate line is. It's in the center, which would work great if I wanted the horizon in the center, but what if I'm using the rule of thirds with regard to landscapes? Does it matter? Or should I go with a slot system, where I would attach a gizmo to the lens and have adjustment with the filter [choice of what I can apply the 'gray' in my shot to diffuse light], does it work like that? I've read about Lee, all good things, but price is a concern. Any good brands that are cheaper, any alternatives?

I appreciate all suggestions in advance.

Answer 1

You can also use your polarizer as a nd filter. Most of them cut about 2 stops. ND filters can be either graduated or not.
The Cokin system allows you to adjust where the graduate line falls. Really, for sunsets, I don't think you even need a nd filter. I usually don't use them at sunset, just meter off a portion of the sky which doesn't include the sun and either exposure lock or set the camera manually.

I have some Tiffen filters, some Nikon, and a few Cokin filters with the holder. There is a reason good filters are more expensive, but I seem to get on well with the somewhat economical Tiffens. Splurge on the circular ploarizer, it will be used more than the others, probably, so get a good one.

Answer 2

I would try something like a Lee or Cokin filter. Instead of buying an adapter with it, use some gaffers tape to hold it to your lens wherever you want the grad. line to be. There was an article about this a few years ago in Pop. Photo. I'll see if I can find the issue.