Lens Lab
    Sigma AF 28-105 mm f/ 4-5.6 UC
    Sigma AF 28-105 mm f/ 4-5.6 UC

    Sigma AF 28-105 mm f/ 4-5.6 UC

    28–105mm · f/4–5.6

    Overview

    The Sigma AF 28-105 mm f/4-5.6 UC is a lightweight, compact zoom with a useful range and close focusing. Optical strengths include acceptable sharpness at mid apertures (f/8-11) and fair bokeh. Weaknesses include yellow color cast, uneven field sharpness, and significant vignetting and flare under bright light. Build quality is solid but the plastic mount may break. It suits budget-conscious users who prioritize low cost and portability over optical perfection.