Canon has released a version of its EF-S 55-250mm F4-5.6 lens that uses its STM stepping motor. STM lenses are designed for movie recording, with the goal of providing smooth and silent focusing. Unlike its predecessor, the STM version of the 55-250 has internal focusing. You’ll be able to pick up the 55-250 STM lens in late September for $ 350. It’s also a safe bet that the 55-250 STM will come bundled with Canon DSLRs in the near future.