The Canon EF-S 10-22mm f/3.5-4.5 USM is a versatile ultra-wide-angle zoom lens tailored for Canon's APS-C format DSLR cameras. Introduced in 2004, it provides an impressive zoom range of 10mm to 22mm, equating to a 16-35mm focal length in full-frame terms.

Key Features:

• High-quality lens construction with 13 elements in 10 groups.
• Broad angle of view: Diagonal 107°30' to 63°30'.
• Maximum aperture range: f/3.5 to f/22.

This lens is recommended for photographers seeking to capture expansive landscapes or architectural subjects. While it performs decently under various conditions, users should be aware of some optical imperfections.

Performance Insights:

• Decent sharpness, particularly when stopped down.
• Notable vignetting at the wide end of the zoom.
• Some chromatic aberration, correctable in post-processing.

In conclusion, the Canon EF-S 10-22mm lens stands out for its extensive zoom capabilities and adequate sharpness, making it a reliable option for a variety of shooting situations.