The sigma 24-105mm f4 dg os hsm lens canon fit is a high performance, wide-angle to mid-range zoom lens specially designed for digital slr cameras with a full-frame sensor, but is compatible with aps-c sensors too. its constant aperture of f/4.0, os (optical image stabiliser) and hsm (hyper sonic motor) enhances the lens’ usability in low-lit environments. the super multi-layer coating reduces flare and ghosting to ensure sharp, high contrast images even in backlit conditions, while the hyper sonic motor ensures silent and smooth focusing with full-time manual override for precise adjustments. the sigma 24-105mm lens features a minimum focusing distance of 45cm and is also compatible with sigma’s usb dock allowing photographers to update its firmware and change focus parameters using sigma’s optimisation pro software.