The Olympus M.Zuiko Digital ED 12-50mm F3.5-6.3 EZ (Silver) zoom lens has a maximum magnification 4.2X, covering a range that extends from a wide angle of 24mm (35mm camera equivalent) ideal for taking wide shots even indoors to a medium telephoto focal length of 100mm (35mm camera equivalent), - optimal for portraits. A newly developed motorized zoom mechanism makes smooth, quiet zooming while shooting movies possible. The AF system is based on the MSC (Movie & Still Compatible) mechanism enhanced by a newly developed linear motor drive that enables faster, quieter focusing. Dust and Splash Proof construction lets you shoot in harsh conditions without worry.
This is the magnifying factor of a lens. Macro lenses will often be described by their “magnification factor”. A lens with a 1:1 magnification factor produces a projected image on the sensor which is the same as the subject.
10 Elements in 9 Groups - DSA lens, 2 Aspherical lenses and ED Lens
Elements / Groups:
The individual pieces of glass that form the overall optical construction. Most lenses have between four and eleven elements to bend the light rays to ensure a perfectly formed image appears on the light sensitive surface, such as a film or CCD. The elements are arranged in groups and may be seen in specification sheets as, for example, 6 elements in 4 groups. That configuration may have two single elements and the other four grouped in pairs.
A lens with a 1:1 magnification factor produces a projected image on the sensor which is the same as the subject. A 1:1 magnification factor is usually considered the minimum for a lens to be described as a “macro” lens. Specialist macro lenses are often 1:3 or even 1:10 magnification factors, meaning that 1mm across the subject becomes 3mm or 10mm when projected onto the sensor, thus 3 or 10 times magnification.