Eiki AH-CD20101 Zoom Long-Throw Lens Guide for EIP-UHS100 and EIP-XHS100

Eiki OEM Lens AH-CD20101 Zoom is an OEM optical accessory for Eiki professional projectors. It is a long-throw (Long Throw) lens with a throw ratio of 1.73-2.27:1. The factory compatibility list covers 2 models; before installation, simply verify the projector model and panel size—no adapter rings needed. The value of an OEM lens lies not in the extra rows of figures in its specifications, but in the fact that it is calibrated at the factory to the optical path and lens mount of projectors in that series: once installed, the image circle, edge illumination, and focusing range all meet their design values, so there is no need to compensate for image quality with keystone correction.

1. Lens Specifications

Specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not listed in the specifications table, please verify them with us based on the projector model. Ordering solely because the model numbers look similar carries the risk that the lens will not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (1.73-2.27:1), so each image size corresponds to a range of installation distances; the lens can focus at any distance within that range.

These figures represent the clear distance from the front surface of the lens to the projection screen and do not include space behind the projector for ventilation and cable connections. The calculations are based on a 16:10 image; actual values are subject to on-site measurement and the original manufacturer's manual.

Image quality differs at the two ends of the zoom range: near the close end, the image is brighter and the edges are slightly softer; near the far end, the edges are sharper and the brightness is slightly lower. Where the venue allows, placing the lens in the middle of the range is recommended. After installation, first find the sharpest position using the focus ring, then fine-tune the lens shift.

3. Compatible Projector Models (2 Models)

The following table is taken from the factory compatibility list. Brightness and resolution have been populated from the model database; where data is unavailable, “—” is shown, with no values estimated.

To determine whether a model outside the list is compatible, please send us photos of the projector nameplate and the existing lens for verification. Platforms of the same generation often share the same mount, but ordering based on a similar model number is not worth the risk.

Throw Ratios by Projector Model Series

The rated throw ratio varies by series when the same AH-CD20101 Zoom is installed. Select the value based on the series of the projector you actually own.

4. Three Checks Before Replacement

• Confirm the projector's imaging chip and resolution. OEM lenses are designed for specific panel sizes. If the panel specifications differ, the image circle cannot provide full coverage, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 1.73-2.27:1. Use the table in Section 2 to match the dimensions of your installation site. A fixed-focus lens offers no adjustment margin, while a zoom lens should also allow for 10–20 cm of clearance at both ends.
• Check the mount and lock engagement. OEM lenses are calibrated to the lens mounts of projectors in the relevant series, and you must hear the lock engage fully after installation. Image skew and soft edges are usually caused by incomplete lock engagement, not by the lens itself.

If you are unsure, send us one photo each of the projector nameplate and the nameplate on the existing lens. Verification against the actual hardware is the most reliable approach.