The Eiki AH-55201 is a fixed ultra-wide angle lens designed for specific Eiki large-venue and installation projectors. With an 11.6mm focal length and fast F2.5 aperture, this lens produces a throw ratio of 0.8:1, allowing the projector to generate massive images from extremely short distances. This makes it ideal for rear-screen projection setups, immersive environments, corporate lobbies, museums, trade show exhibits, houses of worship, and other spaces where projection distance is severely restricted.

As a fixed lens rather than a zoom design, the AH-55201 offers optimal optical performance at its specific focal length, typically delivering superior edge-to-edge sharpness and minimal distortion compared to zoom counterparts at wide angle settings. The fast F2.5 maximum aperture ensures excellent light transmission, helping to maintain bright image levels even when projectors are run in eco mode or when lamp output is reduced after extended use.

Installation requires following specific procedures documented in Eiki's service manuals. Before lens exchange, the lens shift must be reset to the center position using the projector's H&V LENS SHIFT and UNDO buttons. After physical installation, the projector menu requires proper lens type selection under the "Selecting the Lens Type" section, where the AH-55201 corresponds to "Type 1" among available options. The lens cover must be fully inserted for the projector to power on, and the lens cannot be removed while the projector is ceiling-mounted due to safety concerns.