Samsung EV-NX2000BABUS - Manual (Page 50)

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Lenses
49
No. Description
1
Aperture value
A range of supported aperture values. For example, 1:3.5–6.3 means
the maximum aperture value range from 3.5 to 6.3.
2
Focal length
The distance from the middle of the lens to its focal point (in
millimeters). This figure is expressed in a range: minimum focal length
to maximum focal length of the lens.
Longer focal lengths result in narrower angles of view and the subject
is magnified. Shorter focal lengths result in wider angles of view.
3
ED
ED stands for Extra-low Dispersion. Extra-low dispersion glass is
effective in minimizing chromatic aberration (a distortion that occurs
when a lens fails to focus all colors to the same convergence point).
4
OIS (p. 93)
Optical Image Stabilization. Lenses with this feature can detect
camera shake and effectively cancel out the movement inside the
camera.
5
Ø
The lens diameter. When you attach a filter to the lens, make sure that
the diameters of the lens and the filter are the same.
Lens markings
Find out what the numbers on the lens signify.
SAMSUNG 18-200 mm F3.5-6.3 ED OIS lens (example)
1 2 3 4 5