Sigma 50mm F1.4 DG DN Art vs Tamron 70-180mm F/2.8 Di III VC VXD G2
The bottom line
These cover different focal lengths — the Sigma 50mm F1.4 DG DN Art is 50mm, the Tamron 70-180mm F/2.8 Di III VC VXD G2 is 70-180mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 50mm F1.4 DG DN Art for short-telephoto / portrait, the Tamron 70-180mm F/2.8 Di III VC VXD G2 for telephoto.
Choose the Sigma 50mm F1.4 DG DN Art if…
- ✓You want more light and background blur — f/1.4 is faster than f/2.8, better for low light and subject separation.
- ✓You prefer a fast, compact single focal length — a 50mm prime over a zoom.
- ✓You value portability — at 665g (1.47 lb) it's lighter than the 855g (1.88 lb) alternative for travel and all-day carry.
Choose the Tamron 70-180mm F/2.8 Di III VC VXD G2 if…
- ✓You need more reach — it goes to 180mm vs 50mm for distant subjects, wildlife and sport.
- ✓You want one-lens flexibility — a 70-180mm zoom covers what the fixed 50mm can't reframe.
- ✓You shoot handheld or on an unstabilised body — it has optical stabilisation, the other doesn't.
- ✓You like close-focus work — 0.25x magnification vs 0.15x.
Where they differ
- ›Aperture: the Sigma 50mm F1.4 DG DN Art opens to f/1.4 vs the Tamron 70-180mm F/2.8 Di III VC VXD G2's f/2.8 — more light and shallower depth-of-field.
- ›Focal range: Sigma 50mm F1.4 DG DN Art is 50mm, Tamron 70-180mm F/2.8 Di III VC VXD G2 is 70-180mm — different framing and reach.
- ›Type: the Tamron 70-180mm F/2.8 Di III VC VXD G2 is a zoom (flexible framing), the Sigma 50mm F1.4 DG DN Art a prime (one focal length, usually brighter and lighter).
- ›Stabilisation: only the Tamron 70-180mm F/2.8 Di III VC VXD G2 has optical stabilisation — steadier handheld shots, especially on bodies without IBIS.
- ›Weight: the Sigma 50mm F1.4 DG DN Art is 665g (1.47 lb) vs 855g (1.88 lb) — you'll feel the difference handheld.
Frequently asked
Is the Sigma 50mm F1.4 DG DN Art or the Tamron 70-180mm F/2.8 Di III VC VXD G2 better?
These cover different focal lengths — the Sigma 50mm F1.4 DG DN Art is 50mm, the Tamron 70-180mm F/2.8 Di III VC VXD G2 is 70-180mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 50mm F1.4 DG DN Art for short-telephoto / portrait, the Tamron 70-180mm F/2.8 Di III VC VXD G2 for telephoto.
Who should choose the Sigma 50mm F1.4 DG DN Art?
Choose the Sigma 50mm F1.4 DG DN Art if you want more light and background blur — f/1.4 is faster than f/2.8, better for low light and subject separation. Choose it if you prefer a fast, compact single focal length — a 50mm prime over a zoom. Choose it if you value portability — at 665g (1.47 lb) it's lighter than the 855g (1.88 lb) alternative for travel and all-day carry.
Who should choose the Tamron 70-180mm F/2.8 Di III VC VXD G2?
Choose the Tamron 70-180mm F/2.8 Di III VC VXD G2 if you need more reach — it goes to 180mm vs 50mm for distant subjects, wildlife and sport. Choose it if you want one-lens flexibility — a 70-180mm zoom covers what the fixed 50mm can't reframe. Choose it if you shoot handheld or on an unstabilised body — it has optical stabilisation, the other doesn't. Choose it if you like close-focus work — 0.25x magnification vs 0.15x.
What is the main difference between the Sigma 50mm F1.4 DG DN Art and the Tamron 70-180mm F/2.8 Di III VC VXD G2?
Aperture: the Sigma 50mm F1.4 DG DN Art opens to f/1.4 vs the Tamron 70-180mm F/2.8 Di III VC VXD G2's f/2.8 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 50mm | 70-180mm |
| Lens Type | Prime | Zoom |
| Optical Elements | 17 | 22 |
| Optical Groups | 13 | 18 |
| Aperture & Iris | ||
| Maximum Aperture | f/1.4 | f/2.8 |
| Minimum Aperture | f/16 | f/22 |
| Aperture Blades | 11 | 9 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | Full-Frame | Full-Frame |
| Lens Mount | Sony E | Sony E |
| Angle of View | 47° | 34° – 14° |
| 35mm Equivalent | − | − |
| Focus | ||
| Autofocus | Yes | Yes |
| Focus Motor | HLA | VXD |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | Yes |
| Min Focus Distance | 40 cm | 52 cm |
| Max Magnification | 0.15x | 0.25x |
| Stabilization & Video | ||
| Optical Stabilization | No | Yes |
| Aperture Ring | Yes | No |
| Declickable Aperture | Yes | No |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $999 | $999 |
| Filter Size | 72mm | 67mm |
| Diameter | 80.2mm | 80mm |
| Length | 111.3mm | 165.6mm |
| Weight | 665g (1.47 lb) | 855g (1.88 lb) |
| Weather Sealed | Yes | Yes |
| Tripod Collar | No | No |
