Appotronics AL-TL213LZ Long Zoom Lens for AL-TU22KA and AL-TU26KA

Appotronics Original Lens AL-TL213LZ Long Zoom is an original optical accessory for Appotronics engineering projectors. It is a long-throw lens (Long Throw) with a throw ratio of 2.13-4.16:1. The factory compatibility list covers 2 models. Before installation, simply verify the projector model and panel size; no adapter ring is needed. The value of an original lens lies not in the extra figures in its specifications, but in the fact that its optical path and mount are factory-calibrated for that model series: once installed, the image circle, edge illumination, and focusing travel are all at their design values, so there is no need to use keystone correction to compensate for image quality.

1. Lens Specifications

The manufacturer's original specifications take precedence. For mechanical dimensions, flange distance, and mount type not listed in the specifications table, please verify them with us using the projector model. Placing an order solely because the model numbers are similar may result in a fitment issue.

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 (2.13-4.16:1) covers a range of installation distances for the same image size, and it can be focused at any position within that range during installation.

These are clear distances from the front of the lens to the screen and do not include space behind the projector for cooling and cabling. The figures are based on a 16:10 image; in practice, confirm them by on-site measurement and against the manufacturer's manual.

Image quality varies at the two ends of the zoom range: near the close end, the image is brighter and the edges slightly softer; near the far end, the edges are sharper and brightness drops slightly. Where the venue allows, use the middle of the range, then find the sharpest setting on the focus ring after installation before fine-tuning the lens shift.

3. Compatible Models (2 Models)

The table below is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the model database; values that cannot be obtained are shown as “—” and are not estimated.

Whether a model not on the list can be used: send us photos of the projector's nameplate and the existing lens for verification. Platforms from the same generation often share a mount, but ordering on the basis of a similar model number is not worth the risk.

Throw Ratio by Model Series

The rated throw ratio varies when the same AL-TL213LZ Long Zoom is installed on the series listed below, 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. The original lens is designed for a specific panel size. With a different panel specification, the image circle cannot cover the full image, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 2.13-4.16:1. Use the table in Section 2 to match the dimensions of your venue. A fixed-focus lens offers no margin, and even a zoom lens needs 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount of that model series. After installation, you must hear it click into the locked position; a skewed image or soft edges are usually caused by incomplete locking, not by the lens itself.

If you are unsure, send us one photo of the projector's nameplate and one of the nameplate on the existing lens. Verification against the actual hardware is the safest approach.