Does the Sony FE 40mm f/2.5 G fit the Sony a7 III?

Yes. The Sony FE 40mm f/2.5 G is a Sony E lens and the Sony a7 III is a Sony E body, so it mounts natively. Both are full-frame, so 40mm is the true field of view — no crop factor.

Last verified 2026-06-21 · Sony E mount · Sony full-frame lens · Sony full-frame body

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What the Sony FE 40mm f/2.5 G gives you on the Sony a7 III

Field of view: 40mm (true full-frame field of view)
Maximum aperture: f/2.5
Type: prime
Where it lands: standard on the Sony a7 III (35–59mm equivalent) — 47 of the 103 Sony E lenses reach this range here, the brightest being the Laowa Argus 35mm f/0.95 FF at f/0.95
Tagged for: Street Everyday Standard prime Travel

Anything to watch for?

No. The Sony FE 40mm f/2.5 G and the Sony a7 III are both Sony E full-frame, which is the fully native pairing — the lens covers the whole sensor and the marked 40mm is the field of view you get.

Other Sony E lenses that use the Sony a7 III's full-frame sensor

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Focal	Lens	Buy	Max aperture	Type	Coverage	Best for
40mm	Viltrox AF 40mm f/2.5	Amazon →	f/2.5	prime	Full-frame	Everyday Compact Street
40mm	Voigtländer Nokton 40mm f/1.2 E	Amazon →	f/1.2	prime	Full-frame	Standard prime Low-light Street
40mm	Zeiss Batis 40mm f/2 CF	Amazon →	f/2	prime	Full-frame	Standard prime Everyday Street
35mm	Sigma 35mm f/1.4 DG DN Art	Amazon →	f/1.4	prime	Full-frame	Street Low-light Wedding & event
35mm	Sony FE 35mm f/1.4 GM	Amazon →	f/1.4	prime	Full-frame	Street Everyday Low-light Wedding & event
35mm	Sony FE 35mm f/1.8	Amazon →	f/1.8	prime	Full-frame	Street Everyday Low-light
35-150mm	Tamron 35-150mm f/2-2.8 Di III VXD	Amazon →	f/2-2.8	zoom	Full-frame	Pro standard zoom Wedding & event Portrait Everyday
35mm	Viltrox AF 35mm f/1.8	Amazon →	f/1.8	prime	Full-frame	Street Everyday Low-light

All 103 Sony E lenses fit the Sony a7 III; 76 of them use its full-frame sensor at full resolution — check any lens against this body · best lenses for the Sony a7 III

Nearby lenses on the Sony a7 III

Viltrox AF 40mm f/2.5 Voigtländer Nokton 40mm f/1.2 E Zeiss Batis 40mm f/2 CF TTArtisan AF 27mm f/2.8 E Sigma 23mm f/1.4 DC DN Contemporary Sigma 30mm f/1.4 DC DN Contemporary

FAQ

Does the Sony FE 40mm f/2.5 G fit the Sony a7 III?
Yes. The Sony FE 40mm f/2.5 G is a Sony E lens and the Sony a7 III is a Sony E body. Lens-to-body compatibility is decided by the mount, so it fits natively.

Will autofocus work?
We do not publish autofocus behaviour — FitMyLens stores only the specs that are fixed facts of the product (mount, focal length, maximum aperture, sensor coverage). Check the Sony product page for AF support on the Sony a7 III.

What focal length will I actually get?
40mm. The Sony a7 III is full-frame and the Sony FE 40mm f/2.5 G is a full-frame lens, so the marked focal length is the field of view you get.

Citing these specs? Go ahead — manufacturer data, last verified 2026-06-21. Copy a ready-made reference:

More: Sony FE 40mm f/2.5 G specs · Every lens on the Sony a7 III · Best lenses for the Sony a7 III · All Sony E lenses · All cameras