Samsung Camera NX1 Body Benutzerhandbuch

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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)
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No.
Description
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.
Focal length
The distance from the middle of the lens to its focal point (in 
millimeters). This figure 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 magnified. Shorter focal lengths result in wider angles of view.
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).
OIS (p. 109)
Optical Image Stabilization. Lenses with this feature can detect 
camera shake and effectively cancel out the movement inside the 
camera.
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.