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If you are going to do landscape photography, you need good, mid-to-wide, glass. I use my 16--45mm lens the most followed by my 40mm limited prime, a 28mm manual prime (30 years old), and a 50mm manual prime (also 30 years old). The older lenses give fantastic color rendition in many circumstances which is why I love using them. I'm also lucky enough to use Pentax gear which is compatible with pretty much every lens Pentax ever made.

I would recommend primes if you can as they usually give the best quality, although my 16-45 does very well...which is why I use it so much.

As for aperture, it's not really that important to have fast glass for landscape photography as you are almost always using a tripod. Plus you need depth of field so choose a lens which has good qualities at mid to small apertures.

I will also carry a good zoom with me for high-definition panoramic work along with a nice pano head. I carry a 55-300mm zoom.

For filters, I pretty much use Singh Rays. I have a set of 6 ND grads (Cokin P style...3 each of hard and soft transitions) as well as a set of two reverse ND grads. I also use a gold-n-blue circular polarizer and a variable ND circular filter as well to get motion. I also have a warming polarizer which I use on occasion.