Eiki AH-D23020 Zoom Long-Throw Projector Lens for EIP-UJT100

Eiki Original Lens AH-D23020 Zoom is an OEM optical accessory for Eiki engineering projectors. It is a long-throw lens with a throw ratio of 4.16-6.96:1. The OEM compatibility list covers 1 model. Before installation, simply verify the projector model and panel size; there is no need to improvise with adapter rings. The value of an OEM lens lies not merely in a few extra figures on the specification sheet, but in the fact that it is calibrated at the factory to the optical path and lens mount of that projector series. Once installed, the image circle, edge illumination, and focusing travel all meet the original design values, with no need for 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 shown in the specification table, please contact us with the projector model for verification. Ordering directly based on a similar model carries the risk that the lens will not fit.

2. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (4.16-6.96:1), so a given image size corresponds to a range of installation distances. The lens can be focused at any point within that range during installation.

These figures represent the net distance from the front surface of the lens to the screen and do not include clearance for rear cooling and cable connections at the projector. They are calculated for a 16:10 image; the actual values should be confirmed through on-site measurement and the manufacturer's manual.

Image quality differs at the two ends of the zoom range. Toward the close-focus end, the image is brighter and the edges are slightly softer; toward the far end, the edges are sharper and the brightness decreases slightly. Where the venue permits, it is recommended to position the lens near the middle of the range. After installation, use the focus ring to find the sharpest image position first, then fine-tune the lens shift.

3. Compatible Models (1 Projector)

The table below is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the model database; entries that cannot be retrieved are shown as “—” and are not estimated.

To check whether a model outside the list is supported, please send us photos of the projector's nameplate and the existing lens for verification. Platforms from the same generation often share the same mount, but the risk of ordering based on a merely similar model is not worth taking.

Throw Ratio by Model Series

The nominal throw ratio varies by model series even when the same AH-D23020 Zoom is installed. When selecting a lens, use the series of the actual projector.

4. Three Checks Before Replacement

• Confirm the projector's chip and resolution.OEM lenses are designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the panel, resulting in vignetting or light loss at the edges after installation.
• Calculate the installation distance first.This lens has a rated throw ratio of 4.16-6.96:1. Apply the table in Section 2 to your venue dimensions. Fixed-focus lenses offer no adjustment margin, while zoom lenses also require 10–20 cm of clearance at both ends of the range.
• Verify the mount and locking mechanism.The OEM lens is calibrated to the lens mount of that projector series. You must hear the lens click into the locked position after installation. A skewed image or soft edges are 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 existing lens nameplate. Verification against the physical units is the most reliable approach.