Eiki AH-A21010 Zoom Telephoto Lens: Compatibility with 17 Projector Models

Eiki Original Lens AH-A21010 Zoom is an original optical accessory for Eiki installation projectors. It is a long-throw lens with a 1.52-2.92:1 throw ratio. The official compatibility list covers 17 projector models; before installation, simply verify the projector model and panel size—no adapter rings are needed. The value of an original lens lies not in extra rows of specifications, but in its factory calibration to the optical path and lens mount of that projector series. Once installed, image-circle coverage, edge illumination, and focusing travel all meet their design values, with no 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 shown in the specifications table, please contact us with your projector model. Ordering directly based on a similar model carries the risk that the lens may not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This original lens has a zoom range of 1.52-2.92:1, so a given image size corresponds to a range of installation distances. The lens can be focused at any distance within that range.

These figures represent the clear distance from the front of the lens to the screen and do not include clearance for projector cooling and cable connections. They are calculated for a 16:10 image; actual distances should be verified on site and according to the manufacturer's manual.

Image performance 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 decreases slightly. When the site permits, use the middle of the range. After installation, find the sharpest position using the focus ring, then fine-tune the lens shift.

3. Compatible Projector Models (17 Models)

The table below is taken from the official compatibility list. Brightness and resolution have been populated from the model database; where data is unavailable, “—” is shown, with no assumptions made.

To check whether a model not listed here is compatible, send us photos of the projector nameplate and the existing lens. Projector platforms from the same generation often share the same mount, but ordering based solely on a similar model name is not worth the risk.

Throw Ratios by Projector Series

When the same AH-A21010 Zoom is used with the series listed below, the nominal throw ratio varies. Select the value based on the series of the actual projector.

4. Three Checks Before Replacement

• Confirm the projector panel and resolution.Each original lens is designed for a specific panel size. If the panel specifications differ, the image circle cannot provide full coverage, resulting in vignetting or light loss at the edges.
• Calculate the installation distance first.This lens has a nominal throw ratio of 1.52-2.92:1. Apply the table in Section 2 to your site dimensions; fixed-focus lenses offer no adjustment margin, and zoom lenses still require an additional 10–20 cm at both ends.
• Verify the mount and locking mechanism.Each original lens is calibrated to the lens mount of its projector series. After installation, you must hear the lens click and lock into place. A skewed image or soft edges are usually caused by incomplete locking 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 actual hardware is the most reliable approach.