The Zuiko Digital Specific Lenses™ let you master light more effectively by using lenses specifically built for digital photography, designed to channel light more accurately to the image sensor for excellent image results from edge-to-edge.

The Zuiko Digital Specific Lenses™ are perfectly matched with the 4/3-type image sensor to deliver light more directly to each of the image's pixels. By filling each pixel more precisely, the outcome is clear: accurate colour, sharp contrast and bright images even at the edges.

Optimised for digital photography, Aspherical and ED glass elements ensure even more beautifully refined clarity and colour. Faster apertures ranging from f2.8/3.5 and faster, along with the compact size and light weight of the lenses provide the flexibility needed to attain such impressive results. These are just some of the many advantages provided by the new Four Thirds system.

Each Zuiko Digital Specific Lens™ also contains its own CPU to further solidify a richly coloured, clear image. These 'smart' lenses transfer data specific to the lens being used to the system's software to correct potential distortions and aberrations that occur in all lenses. Pin cushioning, barrel distortion, shading and other unwelcome phenomena can be eliminated with the single touch of a button.

Lens Elements

Aspherical Lenses
Spherical lenses often cause the periphery of an image to seem out of focus or distorted. The point of focus is clear, but as that point spreads to the edges it loses both clarity and detail. The incident is even more obvious when using wide and ultra-wide angle lenses. To make sure the entire image remains in focus from edge-to-edge regardless of the desired lens, all of our Zuiko Digital Specific Lenses™ contain aspherical lens elements. These digital specific lens elements provide the ideal single point of focus so the integrity of your artistic talent is never compromised.

ED Glass Elements
Many of the Zuiko Digital Specific Lenses™ use ED glass lens elements so you get crisp, clearly focused images without colour fringing. Normal glass lens elements, like a prism, can produce a rainbow of colour as light passes through it. As the light waves pass through our advanced ED optics, the ED glass elements minimise the amount of refraction or rainbow effect of the light that normally occurs to form an image. By providing a straighter path for the light to travel, you get results that are amazingly sharp and absent of any colour smearing or chromatic aberrations.

Modulation Transfer Function
A Modulation Transfer Function (MTF) chart is a graphical representation of a particular lens' contrast (clarity) and its resolution (sharpness). An MTF chart analyses a lens' ability to resolve sharp details in very fine sets of parallel lines.
In viewing MTF charts for Zuiko Digital Specific Lenses™, one measurement is taken from the centre of the image to the top (Meridional), and one diagonally from the centre of the image to the corner (Sagittal). The Meridional lines are shown as dashed lines and the Sagittal lines are solid. The set of lines measured at 20 lines/mm show a lens' contrast, while the set of lines measured at 60 lines/mm show a lens' sharpness.

In the Four Thirds MTF chart, 20 lines per millimetre is used vs. the 10 lines per millimetre for 35mm film lenses.