FE 100–400mm F4.5 GM OSS

Released June 2026

A full-frame E-mount telephoto zoom with a constant F4.5 aperture, internal zooming, optical stabilisation and a drop-in filter holder.

Mount: Sony E
Focal length: 100–400 mm
Max aperture: f/4.5
Stabilisation: Yes
Weight: 1,840 g

What reviewers say

Both praise sharp images, fast autofocus and balanced handheld use, while noting price and the awkward tripod foot. PetaPixel finds clean blurred highlights; Australian Photography notices distracting outlines around some backgrounds. PetaPixel also finds 400mm too short for some birds, while Australian Photography reports slight zoom creep and interference with manual focusing.

From petapixel.com and australianphotography.com

Specifications

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Optics

Lens type: Zoom
Focal length: 100–400 mm
Maximum aperture: f/4.5
Minimum aperture: f/32
Optical construction: 28 elements in 20 groups, including one filter
Special elements: One ED XA and one XA aspherical element, two Super ED and three ED elements
Coatings: Nano AR Coating II; fluorine coating on front element
Diaphragm: 11 rounded blades
Angle of view: 24°–6°10′ full frame; 16°–4°10′ APS-C

Mount and compatibility

Mounts: Sony E
Image circle: Full frame
Image circle detail: Full-frame coverage; 150–600 mm equivalent field of view on APS-C
Teleconverter support: Compatible with Sony SEL14TC and SEL20TC

Focus and stabilisation

Autofocus: Yes
Minimum focus distance: 0.64 m
Maximum magnification: 0.25×
Optical stabilisation: Yes
Autofocus detail: Four XD linear motors and floating focus; full-time direct manual focus and Linear Response MF
Focus distance detail: Minimum focus 0.64 m at 100 mm or 1.5 m at 400 mm
Magnification detail: Sony specifies maximum magnification 0.25×; PetaPixel reports 1:3, which is not used for the main specification
Stabilisation detail: Optical SteadyShot with standard, panning and irregular-motion modes; camera-body coordination and mode 3 depend on body compatibility and firmware
Video features: Design reduces focus breathing; breathing compensation on compatible bodies changes the field of view slightly

Design

Dust and moisture resistant: Yes
Filter diameter: 95 mm
Maximum diameter: 119.8 mm
Length: 328 mm
Weight: 1,840 g
Controls: Four customisable focus-hold buttons, AF/MF and full-time DMF switches, focus limiter, OSS switches, zoom torque switch, tripod-ring click switch and function ring for preset focus, power focus or full-frame/APS-C switching
Zoom design: Internal zoom; barrel length remains unchanged
Filter detail: 95 mm front thread and 40.5 mm drop-in filter; Sony requires the supplied normal filter or optional polarising filter to remain installed when shooting
Weather resistance: Dust- and moisture-resistant design; not guaranteed completely dust- or moisture-proof
Weight detail: Approximately 1840 g lens; separate hood and caps excluded. Sony's specifications do not provide a tripod-mount-excluded weight
Tripod mount: Integrated tripod mount; both reviews note that its foot is not readily removable and lacks direct Arca-Swiss compatibility
Lens hood: ALC-SH187 round bayonet hood
In the box: ALC-SH187 hood, ALC-F95S front cap, ALC-R1EM rear cap, soft case, lens strap, case strap and drop-in filter
Release detail: Sony UK announced on 13 May 2026 with June 2026 availability and an approximate £4400 list price; first-sale precision remains the month. SEL100400MC is the constant-F4.5 model, distinct from the earlier variable-aperture SEL100400GM

Pros and cons

Pros

Constant F4.5 maximum aperture
Internal zooming
Optical stabilisation and teleconverter support

Cons

1840 g lens weight
Integrated tripod mount

Closest rivals

Model	Mount	Focal length	Max aperture	Stabilisation	Weight	Released
SonyFE 100–400mm F5.6–8 OSS	Sony E	100–400 mm	f/5.6–8	Yes	654 g	Aug 2026
SonyFE 100-400mm F4.5-5.6 GM OSS	Sony E	100–400 mm	f/4.5–5.6	Yes	1,395 g	Jul 2017
SonyFE 70-200mm F4 Macro G OSS II	Sony E	70–200 mm	f/4	Yes	794 g	Jul 2023

Sources

Photo: sony.jp

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