Tamron's popular APS-C constant f/2.8 standard zoom with VC — covering 25.5-75mm equiv with stabilisation.
The Tamron SP AF 17-50mm f/2.8 XR Di II VC LD Aspherical (IF) launched in 2009 as the stabilised version of Tamron's hugely popular APS-C constant f/2.8 standard zoom. The addition of VC made it one of the most practical budget f/2.8 zooms for APS-C DSLRs.
Optically good — sharp in the centre throughout with acceptable edge performance. The constant f/2.8 aperture is excellent for events and low light. VC stabilisation provides approximately 4 stops — a real practical advantage. XR, LD, and aspherical elements control aberrations.
Canon EF-S mount with 72mm filter thread. Approximately 570g. No weather sealing. SP designation — Tamron's premium tier. IF internal focusing. Minimum focus distance 29cm. Di II — APS-C coverage only.
Very common used and excellent value. The Sigma 17-50mm f/2.8 OS is the main competitor — both are outstanding budget f/2.8 zooms. The VC version is worth the premium over the non-VC Tamron 17-50mm. Check VC operation — should be smooth and quiet.