OS - OS, OS

Japanese: OS - おおえす,おーえす

Optical Stabilizer. The name of Sigma's lens-shift type image stabilization mechanism. Two sensors installed inside the lens detect up, down, left and right shaking and move parts of the optical system depending on the amount of shaking. Sigma offers two types of image stabilization modes to accommodate various shooting scenes. "Image Stabilization Mode 1" detects both up, down and left and right shaking and corrects camera shake, making it suitable for landscapes and snapshots. On the other hand, "Image Stabilization Mode 2" detects only up and down shaking and is effective for tracking moving subjects (panning). It is written as "APO 80-400mmF4.5-5.6 EX DG OS", but there are still few lenses that are equipped with it (currently only one lens, the APO 80-400mmF4.5-5.6 EX DG OS, is equipped with OS).

OS

Operating System. The basic software that runs a computer. A computer cannot run without an OS. It does a wide variety of things, including managing memory, disks, and peripheral devices. Currently, Windows OS (XP, etc.) and Mac OS (X, etc.) are for general consumers. Linux is one of them.

Source: CameramanWeb Cameraman Photo Terminology Dictionary Information

Japanese:

Optical Stabilizer。シグマのレンズシフト式手ブレ補正機構の名称。レンズ内に設置された2つのセンサーが上下左右のブレを検出、その量に応じて光学系の一部を動かす。シグマではさまざまな撮影シーンに対応するため、手ブレ補正モードを2種類用意。「手ブレ補正モード1」では上下左右の揺れをともに感知して手ブレを補正するので、風景やスナップなどの撮影に適する。かたや「手ブレ補正モード2」は上下の揺れのみを感知、動体の追い写し(流し撮り)に威力を発揮する。「APO 80-400mmF4.5-5.6 EX DG OS」といったように表記されるが、搭載レンズはまだ少ない（OSが搭載されているのは、現在、APO 80-400mmF4.5-5.6 EX DG OSの1本のみだ）。