Highlighted rows differ between the two models.
| Specification | Sigma 170-500mm f/5-6.3 APO - Monture Nikon | Sigma 70-300mm f/4-5.6 DG OS - Monture Nikon |
|---|---|---|
| Mount | ||
| Mount | nikon-f | nikon-f |
| Optics | ||
| Focal (difference) | 170-500 mm | 70-300 mm |
| Aperture (difference) | f/5.0-6.3 | f/4.0-5.6 |
| Prime | No | No |
| Stabilization (difference) | No | Yes |
Pick Model A if you need the extra reach (500 mm) and can accept the slightly dimmer f/5–6.3 aperture; its 170 mm wide end also covers more telephoto ground. Model B stays the better choice if you prefer a brighter f/4 start, optical stabilization, and a lighter, more compact package for subjects within 300 mm.