Appotronics AL-TL089SZ Short Zoom Standard Throw Lens: Fits AL-TU22KA AL-TU26KA AL-TU34KA

Genuine Appotronics Lens AL-TL089SZ Short Zoom is an original optical accessory for Appotronics engineering projectors, featuring a Standard Throw ratio of 0.89-1.29:1. The factory compatibility list covers 3 projector models. Before installation, simply verify the projector model and panel size; there is no need to make do with adapter rings. The value of a genuine factory lens lies not in the additional figures in the specification sheet, but in the fact that it is factory-calibrated to the optical path and mount of that projector series. Its image circle, edge illumination, and focus travel all meet the design values, eliminating the need to compensate for image quality with keystone correction.

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 specifications table, please contact us with the exact projector model. Placing an order based solely on a similar model risks a lens that will not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the installation distance divided by the image width. This genuine factory lens is a zoom lens (0.89-1.29:1), so a given image size corresponds to a range of installation distances, and the lens can focus at any position within that range.

The distances shown are the clear distances from the front surface of the lens to the screen and do not include space behind the chassis for cooling and cable connections. Figures are calculated for a 16:10 image; actual distances should be confirmed by on-site measurement and the manufacturer's manual.

Image quality differs at the two ends of the zoom range. Toward the short end, the image is brighter and the edges are slightly softer; toward the long end, the edges are sharper and the brightness is slightly lower. Where venue conditions allow, we recommend positioning the lens near the middle of the range. After installation, use the focus ring to find the sharpest image position, then fine-tune the lens shift.

3. Compatible Models (3 units)

The table below is taken from the factory compatibility list. Brightness and resolution are populated from the projector model database; unavailable values are shown as “—” and are not estimated.

To determine whether a model outside the list is compatible, send us photographs of the projector nameplate and the existing lens. Projectors based on platforms of the same generation often share the same mount, but the risk of ordering based solely on a similar model is not worth taking.

Throw Ratios for Different Model Series

When the same AL-TL089SZ Short Zoom lens is installed on the series listed below, its nominal throw ratio varies. Use the value corresponding to the series of your actual projector.

4. Three Checks Before Replacement

• Confirm the projector chip and resolution. Genuine factory lenses are designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the full image, resulting in vignetting or edge light loss.
• Calculate the installation distance. This lens has a nominal throw ratio of 0.89-1.29:1. Use the table in Section 2 to calculate the distance for your venue dimensions. A fixed-focus lens offers no adjustment margin, while a zoom lens should also allow a 10–20 cm margin at both ends.
• Verify the mount and locking mechanism. The factory lens is calibrated to the mount of that projector series. After installation, you must hear the lock engage. A skewed image or soft edges are usually caused by incomplete locking, rather than an issue with the lens itself.

If you are unsure, photograph both the projector nameplate and the existing lens nameplate and send them to us. Verification against the actual hardware is the safest approach.