This standard zoom lens weighs 195g and has 3 stops of image stabilization. The minimum working distance on the wide-angle end is 15cm and the lens barrel finish has been improved.
OIS: Optical Image Stabilization
Housed within the barrel are the lens elements. These are the optical framework of the lens which focus and direct light entering the front of the lens into the camera. They are virtually always made from glass of varying quality.
digital-photography-school.com
The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm). ... The longer the focal length (e.g. 55 mm), the smaller the angle and the larger the subject appears to be.
imaging.nikon.com
16–50mm is the focal length of the lens. At 16mm, the widest lens aperture will be F/3.5, while at 50mm the widest lens aperture will be F/5.6.
It means that when zoomed in (highest magnification), the maximum aperture is F/5.6, and when zoomed out (lowest magnification) the maximum aperture is F/3.5.
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