Eiki AH-CD20302 Zoom Long-Throw Lens Review: EIP-UHS100 Compatibility

Eiki Genuine Lens AH-CD20302 Zoom is a genuine optical accessory for Eiki professional projectors, featuring a long throw with a throw ratio of 5.31-8.26:1. The manufacturer's compatibility list covers 1 model. Before installation, simply verify the projector model and panel size; no adapter-ring workaround is needed. The value of a genuine lens lies not in the extra figures in the specification sheet, but in the fact that it is calibrated at the factory to the optical path and mount of that model series. Once installed, the image circle, edge illumination, and focus travel are all set to their design values, eliminating the need to use keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the manufacturer's official specifications. For mechanical dimensions, flange distance, and mount type not listed in the specifications table, please check with us using the exact projector model. Ordering solely because the model numbers appear similar risks receiving a lens that will not fit.

2. Converting Throw Ratio to Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This genuine lens is a zoom lens (5.31-8.26:1), so each image size corresponds to a range of installation distances, and it can focus anywhere within that range.

These are clear distances from the front surface of the lens to the screen and do not allow for the space behind the projector needed for cooling and cable connections. The values are calculated for a 16:10 image; confirm the actual distance through on-site measurements and the manufacturer's manual.

At the two ends of the zoom range, image quality differs: near the shorter-distance end, the image is brighter and the edges are slightly softer; near the longer-distance end, the edges are sharper and brightness is slightly lower. When the venue allows, use the middle of the range. After installation, find the sharpest position on the focus ring first, then fine-tune the lens shift.

3. Compatible Models (1 model)

The following table is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the model database; entries that cannot be found are shown as —, with no assumptions made.

For compatibility with a model not on the list, send us photos of the projector nameplate and the existing lens for verification. Models from the same generation often share a mount, but ordering based solely on a similar model designation is not worth the risk.

Throw Ratios for Different Model Series

The rated throw ratio may differ when the same AH-CD20302 Zoom is installed on a series listed below. Select the value based on the series of the actual projector.

4. Three Things to Confirm Before Replacement

• Confirm the projector chip and resolution. Genuine lenses are designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the full image, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 5.31-8.26:1. Use the table in Section 2 to calculate the distance for your venue. A fixed-focus lens leaves no margin for adjustment, and even a zoom lens should allow 10–20 cm of leeway at both ends.
• Verify the mount and locking mechanism. Genuine lenses are calibrated to the mount of the relevant model series. After installation, you must hear it click into the locked position. A skewed image or soft edges usually indicates that the lens is not fully locked, rather than a problem with the lens itself.

If you are unsure, take one photo of the projector nameplate and one of the existing lens nameplate and send them to us. Verification against the physical items is the safest approach.