Olympus OM-system Zuiko-Auto Macro 20mm F2 lens.

Notes : This lens can not be used mounted directly on a OM camera body.

The world’s first super bright aperture , fully automatic high magnification macro lens. Designed for exceptionally fine image reproduction at magnifications between 4.2 and 16 times life size. Magnification range is 6.8—9.5x with telescopic auto extension tube 65—116  and 5.3—13.6x with auto bellows. High refractive index, low dispersion glass helps virtually eliminate aberrations for excellent  performance even at open aperture.  A helicoids is provided for fine adjustment.

Angle of view : 9º (at high magnification)

Optical construction : 6 elements in 4 groups.

Diaphragm operation : Automatic.

F-stop range : 2 —16.

Minimum focus : —

Minimum field size: 5.7 x 8.6mm (0,2 x 0,3) — 1.8 x 2.6mm (0,1 x 0,1)

Focusing : With Auto extension tube 14, 25, 65-116, or auto bellows.

Fine Focusing : With straight helicoid built into lens

Weight : 170 grams (  6,0 oz)

Length : 46mm ( 1,8 in)

Maximum-diameter : 60mm  ( 2,4  in)

Filter :   Filters can not be used.

Suitable focusing screens :  1-11and 1-12.