Eiki AH-AV21020 Zoom Standard Throw Lens: PRO V1700 and PRO V2000 Compatibility

Eiki Original Lens AH-AV21020 Zoom is an original optical accessory for Eiki engineering projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 0.86-1.25:1. The manufacturer’s compatibility list covers 2 projector models; before installation, simply verify the projector model and panel size—no need to improvise with an adapter ring. The value of an original lens lies not in the extra rows of data in the specification table, but in its factory calibration to the optical path and mount of that projector series: once fitted, the image circle, edge illumination, and focusing range are all at 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 original manufacturer’s specifications. For mechanical dimensions, flange distance, and mount type not shown in the specification table, please verify with us using the projector model; ordering directly based on a similar model risks an incompatible 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 (0.86-1.25:1); a given image size corresponds to a range of distances, and it can be focused anywhere within that range when installed.

These figures represent the clear distance from the lens front surface to the screen and do not include clearance for the projector’s rear ventilation and cable connections. They are calculated for a 16:10 image; in practice, follow on-site measurements and the original manufacturer’s manual.

Image quality differs at the two ends of the zoom range: toward the near end, the image is brighter and the edges are slightly softer; toward the far end, the edges are sharper and brightness decreases slightly. Where site conditions allow, 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 units)

The table below is taken from the manufacturer’s compatibility list; brightness and resolution are populated from the model database. Where data is unavailable, “—” is shown, with no estimates.

To check whether a model outside the list can be used, send us photos of the projector nameplate and the existing lens for verification—platforms from the same generation often share a mount, but the risk of ordering based on a similar model is not worth taking.

Throw Ratios for Different Model Series

The specified throw ratio varies by the series to which the same AH-AV21020 Zoom is fitted, so use the value for the series of the actual projector when selecting a lens.

4. Three Checks Before Replacement

• Confirm the projector chip and resolution.Original lenses are designed for specific panel sizes. 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 specified throw ratio of 0.86-1.25:1; use the table in Section 2 to calculate the distance for your site dimensions. Fixed-focus lenses offer no adjustment margin, while zoom lenses should also allow 10–20 cm of margin at both ends.
• Check the mount and locking mechanism.Original lenses are calibrated to the mounts used on that projector series, and you must hear the lock engage after installation; a skewed image or soft edges usually means the lens is not fully locked, rather than indicating 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; checking the actual hardware is the most reliable approach.