Main Features

1. Large f1.8 aperture and optical design for soft defocusing proper to SLR cameras

The M.ZUIKO DIGITAL 45mm f1.8 is a medium-telephoto, single focal length lens with a focal length of 45mm (equivalent to 90mm of 35mm cameras), developed to allow anyone to take advantage of the background defocusing. The brightness of the f1.8 aperture with a shallow depth of field makes it possible for anyone to shoot portrait pictures emphasizing the subject with soft, beautiful defocusing. The lightweight of mere 116g makes it possible to carry everywhere, anytime in the occasions such as family events. 
To implement perfectly round defocusing, it is necessary to make the vignetting as small as possible, as well as to use a circular diaphragm. Vignetting is a phenomenon in which the defocusing in the image periphery area does not form a perfectly round shape but instead is elliptical like a rugby ball. This deformation occurs because the light incident to the peripheral area obliquely with respect to the optical axis is limited by the diameters of the lens elements before and after the diaphragm. 
With this lens, 8 groups of 9 lens elements, including two E-HR (Extra-High Refractive index) elements, are optimally laid out to ensure maximum image quality with high contrast and sharpness from the center to the peripheral areas, thereby minimizing vignetting. The optical design also helps eliminate ugly double-line defocusing caused by color aberrations.

2. Sophisticated metallic-style finish with high-grade texture and decoration ring for a classy, unified appearance

Simple, yet sophisticated, the textured metallic-style finish gives this lens a clean, classic look that exudes quality and performance. Designed to complement any PEN series camera, this lens also features a decoration ring that can be used to conceal surface irregularities on the hood mount at the front of the lens and create a sense of unity and coherence.

3. MSC (Movie & Still Compatible) mechanism for fast, quiet autofocusing drive

The fruit of advanced optical design technology, the MSC (Movie and Still Compatible) mechanism developed to enable fast, quiet autofocusing with a lightweight lens with a small number of lens elements. By driving the focusing lens directly using a metallic shaft and feed screw finished with precision in the sub-micrometric order, rather than using a gear, which is the cause of operating noise, the MSC ensures ultra-quite focusing. 
The inner focusing system that incorporates the MSC mechanism adjusts focusing by displacing only one group of two small, lightweight lens elements. This enables smooth autofocusing with high speed and low noise. The smooth autofocusing promises comfortable, stress-free shooting of movies as well as still images.

Optional Accessories

LH-40B Lens Hood 

The lens hood cuts unnecessary light from entering the lens during shooting against light and also offers effective lens protection. The LH-40B adopts a circular design and the same color as the lens to match the high-grade texture of the lens.

DR-40 Decoration Ring 

The decoration ring provided as a standard accessory is also available as an option. The decoration ring covers the irregularities on the hood mount at the front of the lens to improve the quality and sense of unity of the external view of the lens. The DR-40 can be used with the M.ZUIKO DIGITAL 14-42mm f3.5-5.6 II R and M.ZUIKO DIGITAL 14-42mm f3.5-5.6 II lenses as well as the M.ZUIKO DIGITAL 45mm f1.8 lens.