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Lens markings
Find out what the numbers on the lens signify.
SAMSUNG 18-200mm F3.5-6.3 ED OIS lens (example)
1
2345
No. Description
1
Aperture value
A range of supported aperture values. For example, 1:3.5–6.3 means
the aperture range is 3.5 to 6.3.
2
Focal length
The distance from the middle of the lens to its focal point (in
millimeters). This gure is expressed in a range: the minimum focal
length to the maximum focal length of the lens.
Longer focal lengths result in narrower angles of view and the subject
is magnied. Shorter focal lengths result in wider angles of view.
3
ED
ED stands for Extra-low Dispersion. Extra-low dispersion glass is
eective in minimizing chromatic aberration (a distortion that occurs
when a lens fails to focus all colors to the same convergence point).
4
OIS (p. 109)
Optical Image Stabilization. Lenses with this feature can detect
camera shake and eectively cancel out the movement inside the
camera.
5
Ø
The lens diameter. When you attach a lter to the lens, make sure that
the diameters of the lens and the lter are the same.