Tamron's extended 15x superzoom for Canon APS-C — duplicate concept of ID 3425 in Canon EF-S mount.
The Tamron 18-270mm f/3.5-6.3 Di II is the Canon EF-S mount version of Tamron's record-breaking 15x superzoom. Covering a 29-432mm equivalent range on Canon APS-C bodies, it pushed the boundaries of all-in-one zoom convenience when released. It appealed to photographers who wanted the maximum possible versatility in a single lens.
Optical quality is a compromise of the extreme zoom ratio. Centre sharpness is adequate at moderate focal lengths but softens at both ends of the range. Corners are consistently weak. Chromatic aberration and distortion are noticeable throughout. VC stabilisation helps at the telephoto end where the slow aperture demands steady hands or higher ISO settings.
Canon EF-S mount, APS-C only. Filter thread is 72mm. Weight is approximately 550 grams. Several versions exist — the PZD version introduced a quieter piezo-drive AF motor. Build quality is functional plastic with a zoom lock switch to prevent creep. No weather sealing. The lens extends considerably at longer focal lengths.
Common and affordable on the used market. Check for zoom creep, smooth AF operation, and clean optics. Best treated as a holiday and travel convenience lens rather than a tool for critical photography. Canon shooters wanting better image quality should consider the Canon EF-S 18-135mm IS STM as a more restrained but sharper alternative.