Sony FE 28-70mm F3.5-5.6 OSS II vs Sony FE 40mm f/2.5 G
The bottom line
The Sony FE 28-70mm F3.5-5.6 OSS II is a zoom (28-70mm) and the Sony FE 40mm f/2.5 G is a 40mm prime. The zoom gives you framing flexibility from one lens; the prime trades that for a fixed focal length that's usually brighter (f/2.5 vs f/3.5) and lighter to carry. Choose flexibility or a fast single focal length.
Choose the Sony FE 28-70mm F3.5-5.6 OSS II if…
- ✓You need more reach — it goes to 70mm vs 40mm for distant subjects, wildlife and sport.
- ✓You shoot wide — it starts at 28mm vs 40mm for landscapes, interiors and architecture.
- ✓You want one-lens flexibility — a 28-70mm zoom covers what the fixed 40mm can't reframe.
- ✓You shoot handheld or on an unstabilised body — it has optical stabilisation, the other doesn't.
Choose the Sony FE 40mm f/2.5 G if…
- ✓You want more light and background blur — f/2.5 is faster than f/3.5, better for low light and subject separation.
- ✓You prefer a fast, compact single focal length — a 40mm prime over a zoom.
- ✓You value portability — at 173g (6.1 oz) it's lighter than the 293g (10.3 oz) alternative for travel and all-day carry.
Where they differ
- ›Aperture: the Sony FE 40mm f/2.5 G opens to f/2.5 vs the Sony FE 28-70mm F3.5-5.6 OSS II's f/3.5 — more light and shallower depth-of-field.
- ›Focal range: Sony FE 28-70mm F3.5-5.6 OSS II is 28-70mm, Sony FE 40mm f/2.5 G is 40mm — different framing and reach.
- ›Type: the Sony FE 28-70mm F3.5-5.6 OSS II is a zoom (flexible framing), the Sony FE 40mm f/2.5 G a prime (one focal length, usually brighter and lighter).
- ›Stabilisation: only the Sony FE 28-70mm F3.5-5.6 OSS II has optical stabilisation — steadier handheld shots, especially on bodies without IBIS.
- ›Weight: the Sony FE 40mm f/2.5 G is 173g (6.1 oz) vs 293g (10.3 oz) — you'll feel the difference handheld.
Frequently asked
Is the Sony FE 28-70mm F3.5-5.6 OSS II or the Sony FE 40mm f/2.5 G better?
The Sony FE 28-70mm F3.5-5.6 OSS II is a zoom (28-70mm) and the Sony FE 40mm f/2.5 G is a 40mm prime. The zoom gives you framing flexibility from one lens; the prime trades that for a fixed focal length that's usually brighter (f/2.5 vs f/3.5) and lighter to carry. Choose flexibility or a fast single focal length.
Who should choose the Sony FE 28-70mm F3.5-5.6 OSS II?
Choose the Sony FE 28-70mm F3.5-5.6 OSS II if you need more reach — it goes to 70mm vs 40mm for distant subjects, wildlife and sport. Choose it if you shoot wide — it starts at 28mm vs 40mm for landscapes, interiors and architecture. Choose it if you want one-lens flexibility — a 28-70mm zoom covers what the fixed 40mm can't reframe. Choose it if you shoot handheld or on an unstabilised body — it has optical stabilisation, the other doesn't.
Who should choose the Sony FE 40mm f/2.5 G?
Choose the Sony FE 40mm f/2.5 G if you want more light and background blur — f/2.5 is faster than f/3.5, better for low light and subject separation. Choose it if you prefer a fast, compact single focal length — a 40mm prime over a zoom. Choose it if you value portability — at 173g (6.1 oz) it's lighter than the 293g (10.3 oz) alternative for travel and all-day carry.
What is the main difference between the Sony FE 28-70mm F3.5-5.6 OSS II and the Sony FE 40mm f/2.5 G?
Aperture: the Sony FE 40mm f/2.5 G opens to f/2.5 vs the Sony FE 28-70mm F3.5-5.6 OSS II's f/3.5 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 28-70mm | 40mm |
| Lens Type | Zoom | Prime |
| Optical Elements | 9 | 8 |
| Optical Groups | 8 | 7 |
| Aperture & Iris | ||
| Maximum Aperture | f/3.5 | f/2.5 |
| Minimum Aperture | f/22 | f/22 |
| Aperture Blades | 7 | 9 |
| Rounded Aperture | No | Yes |
| Coverage & Angle | ||
| Format Coverage | Full-Frame | Full-Frame |
| Lens Mount | Sony E | Sony E |
| Angle of View | 75° – 34° | 57° |
| 35mm Equivalent | − | − |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | Stepping | XD Linear |
| Focus Limiter | No | No |
| AF/MF Switch | No | Yes |
| Min Focus Distance | 30 cm | 25 cm |
| Max Magnification | − | 0.23x |
| Stabilization & Video | ||
| Optical Stabilization | Yes | No |
| Aperture Ring | No | Yes |
| Declickable Aperture | No | Yes |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $598 | $599 |
| Filter Size | 55mm | 49mm |
| Diameter | − | 68mm |
| Length | − | 45.5mm |
| Weight | 293g (10.3 oz) | 173g (6.1 oz) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | No | No |
