Sony FE 100-400mm F4.5-5.6 GM OSS

Sony FE 100-400mm F4.5-5.6 GM OSS: reach without giving up mobility

The Sony FE 100-400mm F4.5-5.6 GM OSS, reference SEL100400GM, covers an especially useful range when subject distance changes quickly. At 100mm it remains wide enough to find a bird in flight, follow nearby sport or include an animal’s surroundings. At 400mm it produces a much tighter composition without the size of a 200-600mm. This version is identified by its variable F4.5-5.6 aperture, extending zoom, 1,395g weight and 77mm filter thread. Those details now matter because Sony also offers a different 100-400mm GM with a constant F4.5 aperture.

Key strengths of the Sony 100-400mm F4.5-5.6 GM OSS

• A 100-400mm range for moving from environmental context to a tight subject without changing lenses.
• A 1,395g weight without tripod mount which is easier to pack for travel or a long assignment than a 200-600mm.
• A 0.98m minimum focus distance for flowers, insects, textures and details found in the field.
• A 0.35x maximum magnification providing genuine close-up flexibility without claiming 1:1 macro performance.
• Optical SteadyShot to settle the view and support precise framing at long focal lengths.
• Dual linear motors with DDSSM for fast focusing and stable tracking with compatible Sony cameras.
• Adjustable zoom torque to set a smoother or firmer rotation according to the assignment.
• A 77mm front filter thread that can be shared with many other photographic lenses.
• Sony 1.4x and 2x teleconverter compatibility when extra reach is worth the corresponding loss of light.
• A hood access window for adjusting a polarising filter without removing the hood.

What its specifications change in practice

100, 200, 300 or 400mm: choosing the framing

0.98m close focus: a telephoto zoom that also handles details

The 0.98m minimum focusing distance applies throughout the range and reaches a maximum magnification of 0.35x. In practice, that makes it possible to photograph a resting dragonfly, flower, mechanical detail or surface texture without immediately changing lenses. At 400mm, working distance remains comfortable and the background can be simplified. We still advise using an adequate shutter speed: at high magnification, movement from the photographer, wind or subject becomes more visible. This close-range ability is one of the SEL100400GM’s strongest arguments against a super-telephoto zoom chosen primarily for reach.

Autofocus, OSS and extending zoom: settings that matter

Dual linear motors and DDSSM move the focusing groups quickly and accurately. Actual performance still depends on the camera, AF area and subject-recognition mode. For a bird in flight or an athlete, starting at 100mm makes acquisition easier before tightening the frame. OSS steadies the view and includes a panning mode, but shutter speed should still match the subject’s movement. The barrel extends while zooming, and the torque ring lets the photographer choose a smoother or firmer action, which is useful when the lens is carried pointing downwards.

Sony 100-400 with a 1.4x teleconverter or APS-C camera

The Sony 1.4x teleconverter changes the range to 140-560mm and costs one stop of light, giving approximately F6.3-8 depending on focal length. It makes sense when 400mm is occasionally insufficient but a shorter setup than a 200-600mm is still preferred. A 2x teleconverter produces 200-800mm with two stops less light, making available light, ISO and atmospheric conditions increasingly important. On an APS-C camera, the field of view is equivalent to approximately 150-600mm without changing the physical focal length or maximum aperture.

Sony 100-400 F4.5-5.6, new F4.5 or 200-600: which lens fits?

The new Sony FE 100-400mm F4.5 GM OSS suits photographers who prioritise a constant aperture, internal zoom and the latest tracking design, while accepting an additional 445g. The Sony FE 200-600mm F5.6-6.3 G OSS is more logical when 500mm and 600mm are used routinely, especially for small birds or very distant subjects. The F4.5-5.6 SEL100400GM remains relevant when bag size, 0.98m close focus and the flexibility of 100 to 400mm carry more weight in the decision.

Which Sony camera suits the SEL100400GM?

The Sony A7 IV creates a flexible wildlife, sport and travel combination. The Sony Alpha 1 II adds a readout and burst capability suited to fast subjects, while the Sony A7R VI resolves fine detail and provides substantial cropping latitude. Sony E mount provides mechanical compatibility in each case, but tracking performance depends on the camera, firmware, AF mode and subject. The Sony lenses category offers other focal lengths without confusing this page with the new-generation model.