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 f40 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 s