Eiki AH-EC23030 Zoom Long-Throw Lens for EK-1000LU EK-1100LU EK-1300LU EK-850LU EK-900LU

Eiki OEM AH-EC23030 Zoom Lens is an OEM optical accessory for Eiki engineering projectors. It is a long-throw (Long Throw) lens with a throw ratio of 4.59-7.02:1. The factory compatibility list covers 5 models; before installation, simply verify the projector model and panel size—there is no need to make do with adapter rings. The value of an OEM lens lies not in a few additional lines in the specifications, but in the fact that it is factory-calibrated to the optical path and mount of the relevant projector series. Once installed, the image circle, edge illumination, and focus travel all match their design specifications, so keystone correction is not needed to mask image-quality issues.

1. Lens Specifications

The above specifications are subject to the manufacturer's official data. Mechanical dimensions, flange distance, and mount type are not listed in the specifications table. Please verify them with us using the projector model, as ordering solely on the basis of a similar model carries the risk of a lens that will not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This OEM lens is a zoom lens (4.59-7.02:1), so a given image size corresponds to a range of installation distances. The lens can focus at any installation distance within that range.

The distances above are clear distances from the front surface of the lens to the screen and do not include space behind the chassis for ventilation or cable connections. They are calculated for a 16:10 aspect ratio; actual values are subject to on-site measurements and the manufacturer's manual.

Image quality differs between the two ends of the zoom range: toward the short end, the image is brighter and the edges are slightly softer; toward the long end, the edges are sharper and brightness decreases slightly. If the site allows, target the middle of the range. After installation, first find the sharpest position on the focus ring, then fine-tune the lens shift.

3. Compatible Models (5 Models)

The table below is taken from the factory compatibility list. Brightness and resolution are populated from the model database; unavailable values are shown as —, without making assumptions.

To confirm whether a model outside the list can be used, send us photos of the projector nameplate and the existing lens for verification—platforms from the same generation often share the same mount, but ordering based solely on model similarity is too risky.

Throw Ratio by Projector Series

The rated throw ratio varies by series when the same AH-EC23030 Zoom lens is installed on the following series. When selecting a lens, use the value for the series of the actual projector.

4. Three Checks Before Replacement

• Confirm the projector's imaging chip and resolution. The OEM 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 light loss at the edges.
• Calculate the installation distance first. This lens has a rated throw ratio of 4.59-7.02:1; use the table in Section 2 to calculate the distance for your venue. Fixed-focus lenses offer no margin, and even zoom lenses should have 10–20 cm of clearance at both ends of the range.
• Check the mount and locking mechanism. The OEM lens is calibrated to the mount used on that projector series. You must hear it click into the locked position after installation. A skewed image or soft edges are usually caused by incomplete locking, not by a problem with the lens itself.

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