LoneRangeFinder, That's a good idea. I also have the Nikon 70-300mm VRII lens (67mm filter size) and the new Nikon 80-400mm lens (77mm filter size)

Thanks, It looks like people bring up all sorts of interesting photography related topics.

OddJobber. Thanks for the information. I checked out the filter on the B & H website again. The one that I've been looking at is the Hoya 67mm Pro 1D 16x (4-stop) Neutral Density Filter
It looks by the description that it matches your information with a 16x being a 4-stop.

Thanks to everyone for the info. I'll be trying out the techniques you described.

The problem with superzoom lenses is that they generally have tons of distortion. Engineers have to compromise too much in the optical design in order to achieve the long zoom range. The Nikon 18-140mm, 18-200mm, 18-300mm, and 28-300mm all have a lot of barrel distortion at the wide angle settings and a lot of pincushion distortion at the long settings. If you photography straight lines like a window frame you will see it. Go with zooms with a more conservative zoom range. I've had the Nikon 16-85mm f/3.5-5.6 VRII lens for a few years. It's fantastic and has half the distortion of the superzoom lenses.

Hello UHH members. I'm new to UHH. I've been reading the forum so I thought I should join up. I saw that there is an introduce yourself section but I didn't see where I could type in information about myself. I have about 25 years of experience in photography. I hope to join in when if I have good information about a topic. I've never had a neutral density filter and that's what I was hoping someone could help me with. I'm thinking about buying a Hoya 4-stop ND filter to use on my Nikon 16-85mm lens with my Nikon D7000. It has a f/3.5-5.6 maximum aperture. I was wondering if the ND filter will reduce the light so much that the auto focus sensors will not be able to aquire focus. Will I have to manually focus?