Eiki AH-A22030 Zoom Lens for EK-610U EK-611W EK-612X EK-620U EK-621W EK-623U EK-623UW EK-625U

Eiki Original Lens AH-A22030 Zoom is an original optical accessory for Eiki professional projectors. It is a standard-throw (Standard Throw) lens with a throw ratio of 1.22-1.53:1. The factory compatibility list covers 8 projector models; before installation, simply verify the projector model and panel size—there is no need to resort to adapter rings. The value of an original lens lies not in the extra rows of figures in its specifications, but in the fact that it is calibrated at the factory to the optical path and lens mount of that projector series: once installed, the image circle, edge illumination, and focus travel all match their design values, so there is no need to use keystone correction to compensate for image quality.

I. Lens Specifications

Brand	Eiki (Eiki)
Lens Model	AH-A22030 Zoom
Throw Ratio	1.22-1.53:1
Product Type	Standard Throw
Compatible Models	8 Models
Warranty	12 months; damage not caused by the user is eligible for after-sales service, subject to the date on the dispatch invoice

These specifications are subject to the manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not listed in the specifications table, please verify them with us using the projector model; ordering based solely 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 installation distance to image width. This original zoom lens (1.22-1.53:1) provides a range of installation distances for any given image size, and it can focus anywhere within that range when installed.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 2.62 – 3.29 m
120 inches	2.58 m	Approx. 3.15 – 3.95 m
150 inches	3.22 m	Approx. 3.93 – 4.93 m
200 inches	4.30 m	Approx. 5.25 – 6.58 m

These distances represent the clear space from the front surface of the lens to the screen and do not account for ventilation and cabling space behind the projector. They are calculated for a 16:10 image; verify the actual distance on site and follow the manufacturer's manual.

Image quality varies across the zoom range: at the short-throw end, the image is brighter and the edges are slightly softer; at the long-throw end, the edges are sharper and brightness decreases slightly. Where the venue layout permits, aim for the middle of the range. After installation, find the sharpest setting on the focus ring first, then fine-tune the lens shift.

III. Compatible Models (8 Models)

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 values estimated.

Model	Brightness	Resolution
EIKI EK-610U	—	—
EIKI EK-611W	—	—
EIKI EK-612X	—	—
EIKI EK-620U	—	—
EIKI EK-621W	—	—
EIKI EK-623U	—	—
EIKI EK-623UW	—	—
EIKI EK-625U	—	—

For models not on the list, send us photos of the projector nameplate and the existing lens for verification. Projector platforms from the same generation often share the same mount, but the risk of ordering based on a merely similar model is not worth taking.

Throw Ratios by Projector Series

The rated throw ratio varies by series when the same AH-A22030 Zoom is installed. Use the value for the series of the actual projector when selecting a lens.

Projector Series	Throw Ratio
—	1.22-1.53:1

IV. Three Checks Before Replacement

• Confirm the projector's 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 panel, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. Use the table in Section II to apply the lens's rated throw ratio of 1.22-1.53:1 to your venue dimensions. A fixed-focus lens offers no adjustment margin, and even a zoom lens requires 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount used on that projector series, and you must hear the lock engage after installation. A skewed image or soft edges is usually caused by an incompletely engaged lock, not a defect in the lens itself.

If you are unsure, send us one photo each of the projector nameplate and the existing lens nameplate. Verification against the actual equipment is the safest approach.