Highlighted rows differ between the two models.
| Specification | Canon EF-S 18-135mm f/3.5-5.6 IS STM | 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) | 18-135 mm | 17-50 mm |
| Aperture (difference) | f/3.5-5.6 | f/2.8 |
| Prime | No | No |
| Stabilization | Yes | Yes |
| Build | ||
| Weight (g) (difference) | 480,000 g | — |
Pick Model A if you need a versatile all-in-one zoom with a longer reach (135 mm) and don’t mind the variable aperture. Model B stays the better choice if you prioritize a faster constant f/2.8 aperture for low light and a lower price, as long as the 50 mm telephoto limit fits your needs.