Sigma's constant f/2.8 DX telephoto for Canon — the 50-150mm APO II for APS-C sports.
The Sigma 50-150mm f/2.8 EX DC HSM APO II for Canon EF-S is the Canon mount version of Sigma's unique APS-C constant f/2.8 telephoto zoom described in Nikon F under ID 3700 (non-OS) and ID 4126 (OS). The constant f/2.8 across the 75-225mm equivalent range is unique for APS-C-specific designs. APO elements ensure CA control.
Optical performance is good. Sharpness is very good from f/2.8. The constant aperture provides consistent exposure and DOF throughout. APO elements with SLD glass control chromatic aberration. HSM motor provides fast, quiet AF. This non-OS version lacks stabilisation — the Canon EF-S mount OS version exists separately.
Canon EF-S mount, APS-C. Filter thread is 67mm. Weight is approximately 780 grams. Build quality is solid EX professional. No image stabilisation on this version. The constant f/2.8 in a DX telephoto design is genuinely unique. Tripod collar available. HSM motor is independent of the camera body motor.
Available at reasonable prices. Check AF accuracy and smooth zoom. The constant f/2.8 DX telephoto is a unique specification. The OS version is preferred where available. A capable sports and events lens for Canon APS-C shooters. The lack of IS is the main practical drawback.