Eiki AH-B22030 Zoom Standard Throw Lens: EK-800U Compatible

Eiki Original Lens AH-B22030 Zoom is an OEM optical accessory for Eiki professional projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 1.20-1.50:1. The official 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 in the additional specifications, but in the fact that it is calibrated at the factory to the optical path and lens mount of that model series. Once installed, the image circle, edge illumination, and focusing travel all meet their design values, eliminating the need to compensate for image quality with keystone correction.

I. Lens Specifications

These specifications are subject to the manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please verify them with us using the projector model. Ordering directly based on a similar model carries the risk that the lens will not fit.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (1.20-1.50:1), so a given image size corresponds to a range of distances, and the lens can focus at any position within that range during installation.

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

Image quality differs at the two ends of the zoom range: near the short-throw end, the image is brighter and the edges are slightly softer; near the long-throw end, the edges are sharper and brightness is slightly lower. Where site conditions permit, placing the lens around the middle of the range is recommended. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

III. Compatible Models (1 Projector)

The table below is taken from the official compatibility list. Brightness and resolution are populated from the model database; values that cannot be obtained are shown as "—", and no assumptions are made.

To verify whether a model not on the list is compatible, please send us photos of the projector nameplate and existing lens. Same-generation platforms often share the same lens mount, but the risk of ordering based solely on a similar model is not worth taking.

Throw Ratios by Projector Series

The nominal throw ratio varies by series even when the same AH-B22030 Zoom is installed, so 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 cannot cover the image area, resulting in vignetting or light loss at the edges after installation.
• Calculate the installation distance first.This lens has a nominal throw ratio of 1.20-1.50:1. Use the table in Section 2 to calculate the distance for your venue; fixed-focus lenses offer no adjustment margin, and zoom lenses also require an additional 10–20 cm at both ends.
• Verify the lens mount and locking mechanism.The OEM lens is calibrated to the lens mount of that model series. You must hear it click into the fully locked position after installation. A skewed image or soft edges are usually caused by incomplete locking rather than an issue with the lens itself.

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