Combining a versatile 12-24mm focal range with a constant f/4 aperture, this lens delivers sharp results through 4 aspherical and 4 ED glass elements in a compact 565g body. Its dust and moisture-resistant build and Nano AR Coating ensure reliable performance with dramatically reduced flare, even in challenging light. This is best for landscape and architecture photographers who need an ultra-wide, rectilinear zoom that remains portable for extensive field work.