Highlighted rows differ between the two models.
| Specification | Canon EF-S 15-85mm f/3.5-5.6 IS USM | Tamron SP AF 17-50mm f/2.8 XR Di II VC LD Aspherical (IF) - Monture Canon EF-S |
|---|---|---|
| Mount | ||
| Mount | canon-ef-s | canon-ef-s |
| Optics | ||
| Focal (difference) | 15-85 mm | 17-50 mm |
| Aperture (difference) | f/3.5-5.6 | f/2.8 |
| Prime | No | No |
| Stabilization | Yes | Yes |
Pick Model A if you need the extra reach (85 mm) and wider starting focal length (15 mm) for versatile shooting, especially in well-lit conditions. Choose Model B if budget is a priority and you prefer a brighter constant f/2.8 aperture for low-light performance or shallower depth of field within the 17-50 mm range.