Competition heats up in the ultra-wide angle zoom market with the announcement of Tamron’s new 10-24mm f/3.5-4.5 bringing a competitor into the field from every one of the major manufacturers (Canon, Nikon, Tokina, Sigma and now Tamron). If CA is well controlled and the lens is sharp enough, this could give Canon’s EF-S 10-22 f/3.5-4.5 [...]