It's a smallish English country town, with little to differentiate it from other towns along the train line you've been riding today. Except for this: a huge mixed-architecture cathedral plunked smack in the middle of the park that occupies much of the downtown. And it's huge! You want a photograph that will give viewers a sense of the imposing nature of this structure, but your kit lens just won't do the job. Time for this 14mm f/2.8 L-series Canon lens to go to work and show you what it's made of.
Getting the outside of an entire medieval cathedral to fill a frame is just one of this lens's many capabilities. Interiors of houses will present fewer challenges because of the extra scope. Plus they won't necessarily need a flash unit, because the f/2.8 maximum aperture is so good at making great images by maximizing the light you have.
It's an L series lens, so it's designed for durability and weather-resistance. And the optical elements are crafted to Canon's usual impeccable standards: two aspherical and two ultra-low-dispersion elements help your wide-angle images to be as sharp and clear as they can be.