Eiki AH-AV21030 Zoom Long-Throw Projector Lens Guide: PRO V1700, PRO V2000

Eiki OEM Lens AH-AV21030 Zoom is an original optical accessory for Eiki installation projectors, featuring a long throw (Long Throw) and a throw ratio of 1.24-2.01:1. The factory compatibility list covers 2 models; before installation, simply verify the projector model and panel size, with no need to resort to adapter rings. The value of an OEM lens lies not in the extra rows of numbers 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: the image circle, edge illumination, and focus travel are all designed values, so there is no need to use keystone correction to compensate for image quality.

I. Lens Specifications

The above specifications are subject to the OEM specifications. For mechanical dimensions, flange distance, and mount type not shown in the specification table, please verify them with us based on the exact projector model. Ordering based only on a similar model carries the risk of the lens not fitting.

II. Calculating Installation Distance from Throw Ratio

A throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (1.24-2.01:1), so each image size corresponds to a range of distances, and it can focus anywhere within that range.

The distances above are clear distances from the front of the lens to the screen and do not include space behind the projector for cooling and cable connections. They are calculated for a 16:10 image; actual distances should be confirmed by on-site measurement and in the OEM manual.

Image quality varies 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 is slightly lower. Where the venue allows, we recommend positioning the lens in the middle of the range. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

III. Compatible Models (2 Models)

The following table is taken from the OEM compatibility list. Brightness and resolution are populated from the model database; unavailable values are shown as “—” without speculation.

To determine whether a model outside the list is compatible, send us the projector nameplate and a photo of the existing lens for verification. Platforms from the same generation often share the same mount, but the risk of ordering based on a similar model is not worth taking.

Throw Ratios by Model Series

The stated throw ratio varies when the same AH-AV21030 Zoom is installed on the following series, so use the value for the series of the actual projector when selecting a lens.

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 full image, resulting in vignetting or light loss at the edges.
• Calculate the installation distance first. This lens has a rated throw ratio of 1.24-2.01:1; use the table in Section II to match the dimensions of your venue. A fixed-focus lens offers no adjustment margin, and even a zoom lens should allow an extra 10–20 cm at both ends.
• Check the mount and locking mechanism. The OEM lens is calibrated to the mount of that projector series, and you must hear it lock into place after installation. A skewed image or soft edges are usually caused by incomplete locking, not by a defect in the lens itself.

If you are unsure, photograph the projector nameplate and the nameplate on the existing lens and send them to us. Verification against the actual items is the safest approach.