18-55 mm lens for nikon d3100, is that enough for an amateur photographer?

I'm new into DSLR photography, and I wanted to know is the lens 18-55 that comes with Nikon enough for me!
Or should I be condsidering buying a 18-105mm.

It really depends upon the type of photography you choose to pursue. The longer the lens… The greater the capabilities of the camera. However, the amount of light that makes it through the diaphram is determined as well by the length of the lens. Therefore, a 200mm lens will need more light than a 50mm for that same photograph.

Keep in mind that digital cameras have better low-light capabilities than older film cameras.

For general snapshot photography, I think that you'll be much better off with a lens that has greater capabilities than just 55mm

Yes. It's fine. Buy more lenses later, when you know you want to for sure.

It's enough for you until it starts to limit some kinds of pictures that you want to take (e.g.wildlife, sports, macro, low light settings). Wait until then to think about getting another lens. The 18-105 is a bit more versatile and might cause that time to be later.

The 18-55 is a perfectly decent lens to learn on. You don't particularly want a lens that does everything because it won;t do anything well.

The 18-105 you are probably refrencing is this one:
http://www.henrys.ca/24039-NIKON-DX-VR-18-105-F3-5-5-6-AF-S-LENS.aspx

The only advantage it offer is a greater zoom (as seen by the 105mm focal lengh as compared to the 55mm on the basic kit lens).

I personally don;t thin that lens is worth 400$Can (379.99+tax).
Save that 400$ to buy one of the following eventually instead.

NIKON 80-200MM/2.8 AF DED
(http://www.henrys.ca/801-NIKON-80-200MM-2-8-AF-DED.aspx)

NIKON AF-S 70-200 F2.8 VR II LENS
(http://www.henrys.ca/858-NIKON-AF-S-70-200-F2-8-VR-II-LENS.aspx)

NIKON DX NIKKOR AF-S 17-55MM F2.8 IF ED
(http://www.henrys.ca/Categories/73-Camera-Lenses-NIKON.aspx/4/80000010%5eNIKON)

NIKON AF-S 24-70 F2.8 G ED
(http://www.henrys.ca/852-NIKON-AF-S-24-70-F2-8-G-ED.aspx)

Your choice of lens will Really be dependent upon the type of photography oyu like doing but your should always buy the best lens you can as the lens will outlive our camera.

The cheap consumer lenses oyu are looking at (like the 18-105) are bad because the have small apertures and the size of the aperture varies as you zoom in. For example: starting at f3.5 at 18mm and going to 5.6 the closer you get to 105mm.

You might be wondering: Why is this important?
Aperture is one of the two factors that determins how much light hits the sensor.a smaller number means a larger opening. A larger opening means more light is allowed to hit the sensor.

Haveving a wider aperture allows you more options when shooting in low light or when more speed is needed to freeze the action (faster shutter speed).

Each fstop equals one "level" of light.
f1.4, f2, f2.8, f4, f5.6, f8, f11, f16, f22, f32, f45, f64, f90, f128

So a from 18mm at 3.5 (3.5 is a partial level of light between 2.8 and 4) and 5.6 at 105mm we LOSE the equivalent of 2 levels of light.

This means we have to leave the sensor exposed LONGER (a slower shutter speed) at 105mm when compared to 18mm as we lose a little over 2 levels of light.

Each change in Shutter Speed (how long the sensor is exposed to light) is equal to one "level of light".

So let's say you were shooting zoomed out with a 18-105 and you got a perfectly exposed picture at 18mm, f3.5, shutter speed, 1/125th and decided you wanted to zoom in to take a closer shot of the subject. Let's say you zoomed in all the way to 105mm. You lost 2 levels of light since your lenses effective aperture will have shrunk from 3.5 to 5.6. This means that to get the same amount of light you would have to slow your shutter from 1/125 of a second down to 1/30th. At 1/30, you start to get motion blur.especially if there's fast action in the scene.

Of course you could adjust your sensitivity (ISO) but that has it's own issues.

Now a lens that has a constant aperture won;t need a drop in shutter speed. On top of this. Most good lenses have a very wide aperture (f2.8 or even wider). This means that if you are using a 70-200 f2.8 lens and you zoom in at 105mm you could shoot the following settings for the previous example.

70-200 f2.8 lens
70mm, f2.8, shutter speed 1/250th, ISO 100
105mm, f2.8, shutter speed 1/250th, ISO 100

18-105mm f3.5 - f5.6
18mm, f3.5, shutter speed 1/125th, ISO 100
105mm, f5.6, shutter speed 1/30th, ISO 100

But to start, learn with the kit lens and discover your prefrences in terms of subject.