What is the best lens for a Canon T2i camera?

The best lens for a Canon T2i camera depends on your specific needs and preferences. Some popular options include the Canon EF 50mm f/1.8 STM for portraits and low-light Photography, the Canon EF-S 18-135mm f/3.5-5.6 IS USM for versatile shooting, and the Canon EF-S 10-18mm f/4.5-5.6 IS STM for wide-angle shots. Consider your shooting style and subjects to determine the best lens for you.