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    Sigma AF 28-105 mm f/ 3.8-5.6 UC-III Aspherical IF
    Sigma AF 28-105 mm f/ 3.8-5.6 UC-III Aspherical IF

    Sigma AF 28-105 mm f/ 3.8-5.6 UC-III Aspherical IF

    28–105mm · f/3.8–5.6

    Overview

    The Sigma 28-105mm f/3.8-5.6 UC-III is a lightweight, compact zoom with solid build, though the plastic mount may feel weak. Optical strengths include good sharpness at f/8-11 and mid-focal lengths, with consistent, reliable results. Weaknesses include terrible vignetting under artificial lights and ghosting/flare in bright sunlight. It suits budget-conscious users needing a versatile focal range for casual use, especially on APS-C or full-frame at stopped-down apertures.