Leaving the honorable AT-X abbreviation, the letter "i" was newly added. "i" stands for "interactive", implying mutual communication between photographer and the lens.
The "AT-X" in the series name stands for "Advanced Technology-X", to express the advanced performances and specs of its lenses. A well-built exterior and the "one-touch" focus clutch mechanism assure ergonomic and pleasant operations.
The "AT-X" in the series name stands for "Advanced Technology-X", featuring high-performance lenses that realize high specs, functionality and ergonomic operability.