Eiki AH-CD20401 Zoom Long-Throw Lens for EIP-UHS100 and EIP-XHS100

Eiki Original Lens AH-CD20401 Zoom is an original optical accessory for Eiki installation projectors. It is a long-throw lens (Long Throw) with a throw ratio of 2.22-3.67:1. The manufacturer's model compatibility list covers 2 models; before installation, simply verify the projector model and panel size—no adapter ring workaround is needed. The value of an original lens lies not in extra rows in the specification table, 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 range all meet 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 official specifications. For mechanical dimensions, flange distance, and mount type not listed in the specification table, please verify them with us using the projector model. Placing an order solely because a model appears similar may result in a lens that does 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 is a zoom lens (2.22-3.67:1), so a given image size corresponds to a range of distances, and the lens can focus anywhere within that range during installation.

These figures represent the clear distance from the front surface of the lens to the screen and do not account for space behind the projector for ventilation and cable connections. They are calculated for a 16:10 image; actual distances should be confirmed by on-site measurement and the manufacturer's manual.

Image quality differs at both ends of the zoom range: the image is brighter with slightly softer edges near the short-throw end, while the edges are sharper with slightly lower brightness near the long-throw end. If the venue allows, use the middle of the range. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

3. Compatible Models (2 Models)

The table below is taken from the manufacturer's model compatibility list. Brightness and resolution are populated from the model database; unavailable information is shown as “—”, with no assumptions made.

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

Throw Ratios by Model Series

The rated throw ratio of the same AH-CD20401 Zoom varies among the model series below. When selecting a lens, use the value for the series of the actual projector.

4. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution. The original lens is designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the full image, resulting in vignetting or light loss at the edges.
• Calculate the installation distance first. This lens has a rated throw ratio of 2.22-3.67:1. Use the table in Section 2 to calculate the distance for your installation site. A fixed-focus lens offers no adjustment margin, while a zoom lens should still allow an additional 10–20 cm at both ends.
• Verify the lens mount and locking mechanism. The original lens is calibrated to the mount of that model series, and you must hear it 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 unsure, take one photo of the projector nameplate and one of the current lens nameplate and send them to us. Verification against the actual hardware is the safest approach.