Looking for Answers about Nikon Inc. AF-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR?

Not sure what you mean, but it will operate at whatever focal length between 55 and 300mm that you like. All telephoto lenses are that way.

Yes.

So, if I am correct, I can use a 105mm. focal length, or any given number between 55 and 300.

Between 70 and 100 mm, for example.

It is a Zoom lens and you may use any focal length within the range of 55mm to 300mm (x1.5 focal length is DX cameras)

AF-S DX series lens are compatible with D3000.

Yes, this lens has Vibration Reduction (VR) and is compatible with the D3000 since the lens has the internal motor for AF. In the model of the lens you will see VR for Vibration Reduction and AF-S that means the lens has the built-in motor for autofocus.

kenko TCs might.

Defo no!

I agree the 70-300 is much better. You may well also want to use a tripod when shooting at 300mm, the actual focal length on a DX DSLR is 450mm, which means you probably want to have a shutter speed at around 1/500 or faster, if not using a tripod.

it would but the 70 to 300 is a lot better lens for that

Probably not- The maximum aperture is f4.5 so a 2x extender would make it f8, Not enough light to focus.
Look at Nikons lens catalog for wiich extender will work on what lens. Nikon usa.com. That will tell you everything you need to know about Nikon lenses.
Also, don't forget the 1.5x multipication factor for your D7000,makes your lens 105-400mm f4.5-f5.6

Unfortunately, this lens is not fast enough to work well with teleconverters. Nikon AF systems (except D4 & D800) need an effective aperture of f5.6. Adding a teleconverter, even the 1.4x will take this lens beyond that. The 55-300 is a very good value. If you want a little more reach in a zoom, the 80-400 will get you more, but at 4x the price, and it is still not fast enough for teleconverters. It sounds like your needs may be up in the price range of the exotics. The 200-400 f4 zoom will take a teleconverter and get you out to almost 600mm. Similarly, the fast telephotos will take teleconverters as well, but we are talking serious $$$ for all of these lenses. Unfortunately, the level of optics that you are looking for is not really available at the price point of this lens. Renting a lens might be a good way to figure out which way to go.

In some situations. I use it to take scenic closeups. I.e., sunsets, flowing water, vegetation, people, or animals with a distorted background. The 18-135 mm AF VR works very well for landscapes.

Yes it will. All functions supported with AF-S lenses.

Yes it will. Any AF-S lens will work with your camera.

The 55-300 lense works great with D70. It is not heavy and has the stabilizer for motion

all Nikon lens with "AF-S" should work with you D5000

what body are you using? if it's one of the new ones (d3100, d5100 or d7000), or one of the big ones (d700, d3s/d3x), amp up the iso and you may get away with a 70-300 f/4-5.6. if one of the old ones, you need to get hold of a brighter lens (around f/2.8 constant or f/3.5 constant). don't use flash, it doesn't work at such distances. also, a monopod or a tripod with a loose head is good so you won't get tired holding a body with a larger lens, and it also helps with hand tremor.

it is metal.

58mm filter size.

kenko TCs might work, nikon TCs will not.

Yes work great and sharp zoom lens in compact size. I'm really love it.

Yes it will. This lens has the built in focus motor.....the D80 body does not. AF-S means it uses the Silent Wave Technology focus motor to focus. The 55-300 VR lens is an excellent lens for this camera.

No it will not function on FM or FT-3 body. There are no CPU contacts in these older film cameras so you will have no way to control the F Stops, No auto focus & No VR.

Yes, this lens is compatible with the D90.

Yes, the AF-S 55-300mm f/4.5-5.6G ED VR is compatible with the D3200.

Should be 5.5 x 55 = 300