The Sigma 10-20mm F3.5 EX DC HSM.
Pros and photo enthusiasts looking for a fast, compact, constant-aperture ultrawide zoom for landscapes, journalism, and architectural work will love the Sigma 10 to 20mm F3.5 EX DC HSM.
The constant F3.5 aperture throughout the zoom range make this lens great for shooting in low light situations, including building interiors and group shots–or a sweeping landscape in the golden light of early morning or just past sunset in the magical blue twilight moments.