Eiki AH-B24010 Zoom Long-Throw Projector Lens: EK-800U Compatibility

Genuine Eiki Lens AH-B24010 Zoom is a genuine optical accessory for Eiki engineering projectors, featuring a long-throw (Long Throw) design with a throw ratio of 2.00-4.00:1. The factory 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 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 projector series. Once installed, the image circle, edge illumination, and focusing travel are all at their design values, so there is no need to use keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not listed in the specification table, please contact us with the projector model for verification. Ordering solely on the basis of a similar model risks installing a lens that does not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This genuine lens has a zoom range of 2.00-4.00:1. A given image size corresponds to a range of installation distances, and the lens can focus anywhere within that range.

These distances represent the clear distance from the lens face to the screen and do not include space behind the projector for ventilation and cabling. They are calculated for a 16:10 image; actual values should be confirmed by on-site measurement and in accordance with the factory manual.

Image quality varies at the two ends of the zoom range: toward the short-throw end, the image is brighter and the edges are slightly softer; toward the long-throw end, the edges are sharper and brightness is slightly lower. Where the venue allows, we recommend using the middle of the range. After installation, first use the focus ring to find the sharpest position, then fine-tune the lens shift.

3. Compatible Models (1 projector)

The table below is taken from the factory compatibility list. Brightness and resolution are sourced from the model database; values that cannot be verified are shown as “—” and are not estimated.

For models not on the list, please send us a photo of the projector nameplate and the existing lens for verification. Same-generation platforms often share the same mount, but the risk of ordering based only on a similar model name is not worth taking.

Throw Ratio by Projector Series

The nominal throw ratio of the same AH-B24010 Zoom varies among the following projector series. When selecting a lens, use the value for the actual projector series.

4. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution. Genuine lenses are designed for a specific panel size. When the panel specification differs, the image circle cannot cover the panel, causing vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 2.00-4.00:1. Apply the table in Section 2 to the dimensions of your venue. A fixed-focus lens offers no adjustment margin, and even a zoom lens needs 10–20 cm of range at both ends.
• Verify the mount and locking mechanism. The genuine lens is calibrated to the mount of that projector series. After installation, you must hear it lock into place. A skewed image or soft edges are usually caused by an incomplete lock, not by a fault in the lens itself.

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