Sigma 28-105mm f/4-5.6 UC - Unknown Mount

The Sigma 28-105mm f/4-5.6 UC (Ultra Compact) is a versatile standard zoom designed for both film and early digital SLR cameras. Part of the UC series, it focuses on portability and lightweight construction without sacrificing a broad focal range. The 28mm wide-angle makes it suitable for landscapes, while the 105mm telephoto end is ideal for portraits. It is a practical 'all-in-one' lens for photographers who want to minimise gear changes. When inspecting a used model, pay close attention to the autofocus motor performance, as older Sigma AF units can occasionally become noisy or intermittent. SDS checks for the 'sticky' rubber finish often found on Sigma lenses of this era, which can degrade over time. Ensure the internal lens elements are clear of haze and that the plastic lens mount, if applicable to the specific version, is not cracked or excessively worn.