Appotronics AL-TL366LZ Long Zoom Projector Lens Analysis: AL-TU22KA AL-TU26KA Fit

Appotronics Original Lens AL-TL366LZ Long Zoom is an original optical accessory for Appotronics engineering projectors. It belongs to the long throw (Long Throw) category, with a throw ratio of 3.66-5.94:1. The original factory compatibility list covers 2 models; before installation, simply check the projector model and panel size — there is no need to make do with adapter rings. The value of the original lens lies not in a few extra rows of numbers in the specification table, but in the fact that it is calibrated at the factory to the optical path and bayonet mount of that projector series: once fitted, the image circle, edge illumination, and focus travel are all factory-design values, so there is no need to compensate for image quality with keystone correction.

I. Lens Specifications

The above specifications are subject to the original factory specifications. For mechanical dimensions, flange distance, and mount type that are not listed in the specification table, please check with us according to the projector model; ordering directly on the basis of a similar model carries the risk that the lens will not fit.

II. Converting Throw Ratio into Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This original lens is a zoom lens (3.66-5.94:1), so a given image size corresponds to a range of distances; as long as the installation falls within this range, focus can be achieved.

The above is the clear distance from the front of the lens to the screen, excluding space needed for rear cooling and cabling. Figures are calculated on a 16:10 aspect ratio; in practice, on-site measurements and the original factory manual shall prevail.

Image quality differs at the two ends of the zoom range: near the short end the image is brighter and the edges are slightly softer; near the long end the edges are sharper and the brightness is slightly lower. Where the venue allows, it is recommended to position the projector in the middle of the range, and after installation first find the sharpest position on the focus ring, then fine-tune the lens shift.

III. Compatible Models (2 models)

The table below is taken from the original factory compatibility list; brightness and resolution are filled in from the model database, and entries that cannot be retrieved are written as "—" without any guesswork.

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

Throw Ratio by Model Series

The nominal throw ratio of the same AL-TL366LZ Long Zoom lens varies from series to series; when selecting, use the value for the series to which the actual projector belongs.

IV. Three Things to Confirm Before Replacement

• Confirm the projector chip and resolution. Original lenses are designed for a specific panel size; when the panel specifications differ, the image circle cannot cover the full area, and vignetting or edge light loss will appear after mounting.
• Calculate the installation distance first. This lens has a nominal throw ratio of 3.66-5.94:1; apply the table in Section II to your own venue dimensions. A fixed-focus lens leaves no margin, and even a zoom lens needs 10–20 cm reserved at both ends.
• Check the mount and the locking mechanism. The original lens is calibrated to the mount of that projector series; after fitting, you must hear it lock into place. A skewed image or soft edges are usually caused by the lens not being fully locked, not by a fault of the lens itself.

If you are unsure, take one photo each of the projector nameplate and the nameplate of the existing lens and send them to us; checking against the actual items is the most reliable approach.