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Lens markings
Find out what the numbers on the lens signify.
SAMSUNG 50-200 mm F4-5.6 ED OIS lens (example)
12345
No. Description
1
Aperture value
A range of supported aperture values. For example, F 1:4-5.6
means the maximum aperture value range from 4 to 5.6.
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. 74)
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.