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The 18-105 is one of Nikon's kit lenses - cheaper lenses that often come as part of a kit with a camera.
Currently on Amazon at £249.99 this is a (relatively!) cheap lens from Nikon.
The lens looks and feels a nice quality piece of equipment - like all (or possibly nearly all) Nikon lenses it's black, the writing is in silver and gold. It comes like all of them with a body and lens cap, it also has a petal hood and a soft case/bag. It's got a good enough weight to it to be comfortable and balance a camera nicely, but it's light enough you'd not worry about taking it for a day out. The switches (for auto or manual focus and VR on or off) work smoothly, the manual focusing ring is a nice fit and operates easily, everything feels like it's well made.
The image quality is great, if at the extremes of zoom and aperture it can drop slightly, but only a little and you'll only notice if you're doing large crops or prints - at most monitor sizes the difference won't be visible. I've not experienced any vignetting on this (well except due to a filter but that's a whole other review) even when used at extremes of zoom or aperture, I've taken sunrise pictures on this and all have turned out perfectly clear.
This is a fantastic lens for the price, well above the quality of your average kit lens. But if you're looking for a professional grade lens, you may want to go for professional grade glass - at the price tags they come at.
As stated this is an AF-S DX ED VR lens. Just to cap quickly over what that means: AF-S means it has its own motor - it will work on older or entry-level bodies. DX: This means it's designed for DX bodies - this is crop sensored. In current Nikon bodies The D3000, D5000, D90 and D300 are the main DX bodies, although there's many older ones as well. Most professional bodies are fullframe, and therefore this lens could cause vignetting - although it will still fit. ED: (taken from nikon's website) ED (Extra-low Dispersion) glass and Aspherical lens elements ensure high resolution and contrast while minimizing spherical aberration, astigmatism and other forms of distortion. VR: Vibration Reduction helps to reduce camera shake, so perfect if you have shakey hands - this is to allow you to use exposure speeds up to 2 stops lower, allowing for low light conditions, it should be turned off if using a tripod however.
Overall I love this lens - and while I'm hoping to slowly build a collection of professional grade lenses, I can see me keeping this for the simple fact it's light and easy to use - it weighs in at only 420g, meaning you can keep it on you all day.
Overall a great lens for the price. 4* due to slight IQ loss at the extremes.