Sony FE 28-70mm f/3.5-5.6 OSS II vs Tamron 70-300mm f/4.5-6.3 Di III RXD

Both are Sony E mount zooms for budget and travel — here's how the specs differ and which to pick. Every spec is from the manufacturer's own catalog.

Last verified 2026-09-01 · Sony E mount · prices change — check the retailer

Spec	Sony FE 28-70mm f/3.5-5.6 OSS II	Tamron 70-300mm f/4.5-6.3 Di III RXD
Focal length	28-70mm	70-300mm
Max aperture	f/3.5-5.6	f/4.5-6.3
Type	zoom	zoom
Coverage	full-frame	full-frame
Mount	Sony E	Sony E

Which should you buy?

the Sony FE 28-70mm f/3.5-5.6 OSS II opens wider (f/3.5-5.6) — brighter in low light and more background blur
the Sony FE 28-70mm f/3.5-5.6 OSS II covers 28-70mm and the Tamron 70-300mm f/4.5-6.3 Di III RXD covers 70-300mm — pick the range that matches what you shoot
the Sony FE 28-70mm f/3.5-5.6 OSS II is first-party (Sony) for guaranteed full autofocus and in-camera corrections; the Tamron 70-300mm f/4.5-6.3 Di III RXD is third-party — usually the value pick

Where to buy

Sony FE 28-70mm f/3.5-5.6 OSS IISee price on Amazon

Amazon links are affiliate links — we may earn a commission at no extra cost to you.

Tamron A047SF - Telephoto Lens - 70-300mm F/4.5-6.3 Di III RXD for Sony FE, Black

Tamron 70-300mm f/4.5-6.3 Di III RXDSee price on Amazon

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Affiliate links never affect our specs or which lenses we compare.

FAQ

What's the difference between the Sony FE 28-70mm f/3.5-5.6 OSS II and the Tamron 70-300mm f/4.5-6.3 Di III RXD?
The Sony FE 28-70mm f/3.5-5.6 OSS II is 28-70mm f/3.5-5.6 zoom, full-frame; the Tamron 70-300mm f/4.5-6.3 Di III RXD is 70-300mm f/4.5-6.3 zoom, full-frame. Both fit the Sony E mount.

Which is better in low light, the Sony FE 28-70mm f/3.5-5.6 OSS II or the Tamron 70-300mm f/4.5-6.3 Di III RXD?
The Sony FE 28-70mm f/3.5-5.6 OSS II — its f/3.5-5.6 maximum aperture lets in more light and gives more background blur than the f/4.5-6.3 of the other.

Do the Sony FE 28-70mm f/3.5-5.6 OSS II and Tamron 70-300mm f/4.5-6.3 Di III RXD fit the same camera?
Yes — both are Sony E mount lenses, so they fit Sony a7/a9/a1 (full-frame) and a6000-series (APS-C).

Citing these specs? Go ahead — manufacturer data, last verified 2026-09-01. Copy a ready-made reference:

More Sony E comparisons: Tamron 17-70mm f/2.8 Di III-A VC RXD vs Sony E PZ 16-50mm f/3.5-5.6 OSS · Sony E 11mm f/1.8 vs Viltrox AF 20mm f/2.8 · Sony FE 50-150mm f/2 GM vs Sony FE 70-200mm f/2.8 GM OSS · Sony FE 50-150mm f/2 GM vs Tamron 35-100mm f/2.8 Di III VXD · all Sony E lenses · all comparisons

Sony FE 28-70mm f/3.5-5.6 OSS IIAffiliate linkSee price on Amazon