OM System M.Zuiko Digital ED 40-150mm f/2.8 PRO

This OM System zoom spans 40–150mm on Micro Four Thirds cameras. That range covers short telephoto portraits through to tighter, distant subjects such as stage performers and wildlife at moderate range.

The range suits portraits, events and sport when you need to change framing from a fixed position. The f/2.8 maximum aperture stays available throughout the zoom. Check whether the short end is wide enough for groups in the spaces where you usually work.

Olympus introduced the design in 2014. There is no stabilisation inside the lens, so consider the camera body, shutter speed and support you will use. Weight is another factor when planning a kit for a long walking session.

The lens weighs 1 lb 10.8 oz (760 g) without the tripod adapter and measures 6.3 in (160 mm) long and 3.13 in (79.4 mm) across. Allow room for the adapter, hood and caps when packing. A tripod can take the weight during a fixed session. Screw-in filters must match the 72mm front thread.

At 40mm, the view includes more of a person and their setting. At 150mm, a distant player or performer occupies more of the frame from the same spot. The zoom can refine a composition when a barrier prevents moving closer. Changing camera position changes perspective as well as framing.

The f/2.8 maximum aperture stays available throughout the range. At a given shutter speed, it can allow a lower ISO in a dim gym or theatre. A close subject can have a soft background when there is enough space behind it. Available light still determines the exposure settings needed.

A constant maximum aperture does not keep depth of field unchanged as you zoom. Focus distance and focal length also matter. Stop down when more depth is needed for a group, then check whether the resulting shutter speed suits the people in it.

Closest focus is 2.3 ft (70 cm) throughout the zoom, measured from the sensor. Native maximum magnification is 0.21x. This range can help with flowers or details at an event. Leave room ahead of the glass for lighting and check that the camera does not shade the subject.

The body is designed to resist dust and moisture. Use cover in persistent rain and protect the open mount during lens changes. Dry the exterior before storage after a damp session.

There is no image stabilisation in the lens. A camera with body stabilisation can help with shake. Firm support helps during long exposures of still subjects, but moving people still need a suitable shutter speed. There is no zoom lock switch; check the selected focal length before a sequence.

Focusing is internal, so the barrel length stays fixed as focus changes.

The design includes two aspherical elements, three ED elements and one element that combines both types, plus one Super ED element. Aspherical surfaces help correct distortion and spherical aberration. ED glass helps reduce coloured fringes along high-contrast edges. Their presence does not establish measured image quality.