Eiki AH-A22010A Zoom Standard Throw Lens for EK-623U EK-623UW EK-625U EK-815U EK-820U

Eiki Original Lens AH-A22010A Zoom is an original optical accessory for Eiki engineering projectors, featuring a standard throw (Standard Throw) and a throw ratio of 0.75-0.95:1. The factory compatibility list covers 5 models. Before installation, simply verify the projector model and panel size—no adapter rings are needed. The value of an original lens lies not in additional specification figures, but in its factory calibration to the optical path and mount of that projector series: once installed, the image circle, edge illumination, and focus travel are all at their design values, eliminating the need to compensate for image quality with keystone correction.

1. Lens Specifications

Brand	Eiki (Eiki)
Lens Model	AH-A22010A Zoom
Throw Ratio	0.75-0.95:1
Product Type	Standard Throw (Standard Throw)
Compatible Models	5 models
Warranty	12 months; after-sales service is available for damage not caused by the user, subject to the date shown on the sales receipt

The above specifications are subject to the manufacturer's official specifications. For mechanical dimensions, flange distance, and mount type not listed in the specifications table, please contact us with the projector model for verification. Ordering based solely on a similar model carries the risk that the lens will 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 zoom lens (0.75-0.95:1) supports a range of installation distances for each image size, and it can focus at any distance within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 1.61 – 2.04 m
120 inches	2.58 m	Approx. 1.93 – 2.45 m
150 inches	3.22 m	Approx. 2.42 – 3.06 m
200 inches	4.30 m	Approx. 3.22 – 4.08 m

The distances above are clear distances from the front of the lens to the screen and do not account for rear housing ventilation or cable-routing space. These figures are based on a 16:10 image; actual values should be verified on site and according to the manufacturer's manual.

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

3. Compatible Models (5 Models)

The table below is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the model database; where the data are unavailable, they are marked “—” and no assumptions are made.

Model	Brightness	Resolution
EIKI EK-623U	—	—
EIKI EK-623UW	—	—
EIKI EK-625U	—	—
EIKI EK-815U	—	—
EIKI EK-820U	—	—

To verify compatibility with a model not listed, please send us photos of the projector nameplate and current lens. Projector platforms from the same generation often share the same mount, but ordering based on a similar model is not worth the risk.

Throw Ratios for Different Model Series

The nominal throw ratio varies by series when the same AH-A22010A Zoom is installed. Select the value corresponding to the series of the actual projector.

Model Series	Throw Ratio
—	0.75-0.95:1

4. Three Checks Before Replacement

• Confirm the projector chipset 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 edge light loss.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.75-0.95:1. Use the table in Section 2 to calculate the distance based on your venue's dimensions. 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 mount and locking mechanism. The original lens is calibrated to the mount of that projector series. You must hear it lock into place after installation. A skewed image or soft edges usually indicate that the lens is not fully locked, 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, then send them to us. Verification against the physical items is the most reliable approach.