Does the Samyang AF 45mm f/1.8 FE fit the Sony a7 III?

Yes. The Samyang AF 45mm f/1.8 FE is a Sony E lens and the Sony a7 III is a Sony E body, so it mounts natively. Both are full-frame, so 45mm is the true field of view — no crop factor.

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

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Samyang SYIO45AF 45mm F1.8 Auto Focus Compact Lens, Sony E-Mount

Check the Samyang AF 45mm f/1.8 FE price on Amazon →

What the Samyang AF 45mm f/1.8 FE gives you on the Sony a7 III

Field of view: 45mm (true full-frame field of view)
Maximum aperture: f/1.8
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: Standard prime Everyday Compact Travel

Anything to watch for?

No. The Samyang AF 45mm f/1.8 FE 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 45mm 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
50mm	Sigma 50mm f/1.4 DG DN Art	Amazon →	f/1.4	prime	Full-frame	Portrait Low-light Standard prime Wedding & event
40mm	Sony FE 40mm f/2.5 G	Amazon →	f/2.5	prime	Full-frame	Street Everyday Standard prime Travel
50mm	Sony FE 50mm f/1.4 GM	Amazon →	f/1.4	prime	Full-frame	Portrait Low-light Wedding & event Standard prime
50mm	Sony FE 50mm f/1.8	Amazon →	f/1.8	prime	Full-frame	Standard prime Budget Low-light
50mm	Sony FE 50mm f/2.5 G	Amazon →	f/2.5	prime	Full-frame	Street Everyday Standard prime Travel
40mm	Viltrox AF 40mm f/2.5	Amazon →	f/2.5	prime	Full-frame	Everyday Compact Street
50mm	Viltrox AF 50mm f/2.0	Amazon →	f/2.0	prime	Full-frame	Standard prime Everyday Portrait
40mm	Voigtländer Nokton 40mm f/1.2 E	Amazon →	f/1.2	prime	Full-frame	Standard prime Low-light Street

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

Sigma 30mm f/1.4 DC DN Contemporary TTArtisan AF 27mm f/2.8 E Sigma 50mm f/1.4 DG DN Art Sony FE 40mm f/2.5 G Sony FE 50mm f/1.4 GM Sony FE 50mm f/1.8

FAQ

Does the Samyang AF 45mm f/1.8 FE fit the Sony a7 III?
Yes. The Samyang AF 45mm f/1.8 FE 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 Samyang product page for AF support on the Sony a7 III.

What focal length will I actually get?
45mm. The Sony a7 III is full-frame and the Samyang AF 45mm f/1.8 FE 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: Samyang AF 45mm f/1.8 FE specs · Every lens on the Sony a7 III · Best lenses for the Sony a7 III · All Sony E lenses · All cameras