Eiki AH-CD20202 Zoom Standard-Throw Lens for EIP-UHS100 EIP-XHS100

Eiki Original Lens AH-CD20202 Zoom is an original optical accessory for Eiki engineering projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 1.25-1.79:1. The manufacturer's compatibility list covers 2 models; before installation, simply verify the projector model and panel size, with no need to resort to adapter rings. The value of an original lens lies not in the additional figures in its specification table, but in the fact that it is calibrated at the factory to the optical path and lens mount of that model series. Once installed, the image circle, edge illumination, and focus travel all match their design values, so there is no need to use keystone correction to compensate for image quality.

I. Lens Specifications

These specifications are subject to the manufacturer's official specifications. For mechanical dimensions, flange distance, and mount type not listed in the specification table, please verify them with us using the exact projector model. Placing an order solely because the model numbers are similar carries the risk that the lens will not fit.

II. Calculating Installation Distance from the Throw Ratio

A throw ratio is the ratio of installation distance to image width. This original zoom lens (1.25-1.79:1) supports a range of installation distances for the same image size, and the image can be focused anywhere within that range when installed.

These figures represent the clear distance from the front face of the lens to the screen and do not allow for ventilation and wiring space behind the projector. They are calculated for a 16:10 image; actual distances should be confirmed by on-site measurement and in accordance with the 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 brightness is slightly lower. Where site conditions allow, target the middle of the range. After installation, find the sharpest setting on the focus ring first, then fine-tune the lens shift.

III. Compatible Models (2 Models)

The table below is taken from the manufacturer's compatibility list. Brightness and resolution are completed from the model database; unavailable data is shown as “—” and is not estimated.

For models not on the list, send us photos of the projector nameplate and current lens for verification. Platforms from the same generation often share a mount, but ordering based only on a similar model designation is not worth the risk.

Throw Ratios by Model Series

When the same AH-CD20202 Zoom lens is fitted to the series listed below, the rated throw ratio is not the same. Select the value based on the series of the actual projector.

IV. Three Checks Before Replacement

• Confirm the projector chip and resolution. The original lens is designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the full image area, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 1.25-1.79:1. Use the table in Section II to calculate the distance for your installation space. A fixed-focal-length lens provides no adjustment margin, while a zoom lens should still allow an additional 10–20 cm at both ends of the range.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount of the corresponding model series, and you must hear the locking mechanism engage after installation. A skewed image or soft edges is usually caused by incomplete locking, rather than a problem with the lens itself.

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