Eiki AH-B22010 Short Zoom Standard-Throw Lens Overview for EK-800U

Eiki OEM Lens AH-B22010 Short Zoom is an original optical accessory for Eiki professional projectors. It is a standard throw lens with a throw ratio of 0.84-1.02:1. The OEM compatibility list covers 1 model. Before installation, simply verify the projector model and panel size; no adapter ring is needed. The value of an OEM lens lies not in the additional figures in its specifications, but in the fact that it is factory-calibrated to the optical path and lens mount of the corresponding projector series. Once installed, the image circle, edge illumination, and focus travel all operate at their design values, eliminating the need for keystone correction to compensate for image quality.

I. Lens Specifications

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please contact us with the projector model. Ordering based solely on a similar model carries the risk that the lens will not fit.

II. 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 (0.84-1.02:1), so a given image size corresponds to a range of installation distances. It can be focused at any position within that range.

The figures above represent the clear distance from the front of the lens to the screen and do not include space for rear housing ventilation and cable connections. They are calculated for a 16:10 image; actual on-site measurements and the manufacturer's manual take precedence.

Image performance differs at the two zoom extremes: toward the shorter-throw end, the image is brighter and the edges are slightly softer; toward the longer-throw end, the edges are sharper and the image is slightly dimmer. Where the installation environment allows, the middle of the range is recommended. After installation, first use the focus ring to find the sharpest position, and then fine-tune the lens shift.

III. Compatible Models (1 model)

The following table is taken from the OEM compatibility list. Brightness and resolution are populated from the projector model database; unavailable data is marked as "—", with no assumptions made.

To determine whether a model outside the list can be used, please send us photographs of the projector nameplate and the existing lens for verification. Projector platforms of the same generation often share a mount, but ordering based on model similarity alone is not worth the risk.

Throw Ratios by Projector Model Series

The nominal throw ratio of the same AH-B22010 Short Zoom varies across the following projector series. Select the value based on the series of the actual projector.

IV. Three Checks Before Replacement

• Confirm the projector chip and resolution.OEM lenses are designed for a specific panel size. If the panel specifications differ, the image circle will not cover the full panel, resulting in vignetting or light loss at the edges.
• Calculate the installation distance first.This lens has a rated throw ratio of 0.84-1.02:1. Use the table in Section II to calculate the distance based on your installation site's dimensions. Fixed-focus lenses offer no adjustment margin, while zoom lenses should also allow an additional 10–20 cm at both ends of the range.
• Verify the mount and locking mechanism.OEM lenses are calibrated to the lens mount of the corresponding projector series and must audibly lock into place 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 uncertain, take one photograph each of the projector nameplate and the current lens nameplate and send them to us. Verification against the physical products is the most reliable approach.