Wide angle shooters often cringe when they learn the pitfalls of APC-S sensors and the dreaded "crop factor".
But with lenses like the Canon 10-18mm photographers have some hope. Recently a Chinese lens manufacturer threw it's hat in the ring with a wide angle macro lens. The Lens is a 15mm fixed F4 and can photograph subjects within 12 cm, and is averrable for Canon, Nikon, Sony & Pentax cameras. Check out more info at DPreview and Venus' website: