Tamron's legendary APS-C zoom — the 17-50mm f/2.8 non-VC version.
The Tamron 17-50mm f/2.8 XR Di II LD IF Aspherical is a standard-range zoom for APS-C DSLRs covering an equivalent 26–75mm range. Di II indicates APS-C image circle; XR = Extra Refractive elements; LD = Low Dispersion glass; IF = Internal Focus. Released as a bright constant-aperture alternative to variable-aperture kit lenses at an affordable price.
17–50mm zoom range, f/2.8 constant maximum aperture, Di II (APS-C formula), XR/LD glass, IF (internal focus), multiple mount variants produced, approximately 67mm filter thread.
The constant f/2.8 aperture throughout the zoom range is the primary differentiator from kit lenses — consistent exposure and shallower depth of field across all zoom positions benefit event and portrait work. Optical quality is good for its price tier. The Di II (APS-C) designation means it is not designed for full-frame bodies.
Confirm the mount variant (Canon/Nikon/Pentax/Sony) matches your camera body before purchase — mount type is not specified in this listing. Inspect for fungus, haze, and coating condition. Test AF speed and accuracy. Check that the IF mechanism keeps the front element stationary during focusing.