Eiki AH-AC22060 Short Zoom Standard Throw Projector Lens: EK-831DU EK-831U EK-833DU EK-836DU

Eiki Original Lens AH-AC22060 Short Zoom is a genuine optical accessory for Eiki installation projectors, belonging to the standard throw category, with a throw ratio of 0.76-0.95:1. The original compatibility list covers 4 projector models; before installation, simply verify against the projector model and panel size — no adapter rings needed. The value of an original lens isn't a few extra rows of numbers on a spec sheet, but that it is calibrated at the factory to the optical path and mount of that series of projector bodies: once installed, the image circle, edge illumination, and focus travel all match design values, so you don't need 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 focal distance, and mount type not shown in the spec table, please verify with us against your projector model — ordering based on model similarity alone carries the risk of incompatibility.

2. Converting Throw Ratio to Installation Distance

Throw ratio is the ratio of installation distance to image width. This original lens is a zoom lens (0.76-0.95:1), so the same image size corresponds to a range of distances; as long as installation falls within this range, focus can be achieved.

The above figures are the clear distance from the lens face to the screen, excluding rear ventilation and cabling space behind the projector body. Calculated for 16:10 aspect ratio; actual values are subject to on-site measurement 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 with slightly softer edges; toward the far end the edges are sharper with slightly reduced brightness. Where space permits, it is recommended to land in the middle of the range; after installation, first find the sharpest position on the focus ring, then fine-tune the shift.

3. Compatible Models (4)

The table below is taken from the original manufacturer's compatibility list; brightness and resolution are filled in from the model database, with "—" where unavailable — no speculation.

To check whether models outside this list are compatible, please send us photos of the projector nameplate and the existing lens for verification — same-generation platforms often share mounts, but ordering based on model similarity alone is a risk not worth taking.

Throw Ratios Across Model Series

The same AH-AC22060 Short Zoom installed on the following series has different nominal throw ratios; selection should be based on the actual series of your projector body.

4. Three Things to Confirm Before Replacement

• Confirm the projector's chip and resolution. Original lenses are designed for specific panel sizes; with a different panel specification, the image circle cannot cover it, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.76-0.95:1; apply it to your venue's dimensions using the table in Section 2. Prime lenses have no margin, and even for zoom lenses, allow 10–20 cm at both ends.
• Verify the mount and locking. Original lenses are calibrated to the mount of that series of projector bodies; after installation, you must hear the lock engage. Image skew and soft edges are mostly due to incomplete locking, not a problem with the lens itself.

If unsure, take a photo of the projector nameplate and the existing lens nameplate and send them to us — verification against the actual hardware is the most reliable approach.