Appotronics AL-EL300LZ Zoom Long-Throw Lens for AL-SU10KA, AL-SU13KA, AL-SU15KA

Appotronics Genuine Lens AL-EL300LZ Zoom is a genuine optical accessory for Appotronics professional projectors. It is a long-throw (Long Throw) lens with a throw ratio of 2.86-4.85:1. The manufacturer's official compatibility list covers 3 models. Before installation, simply verify the projector model and panel size—there is no need to make do with an adapter ring. The value of a genuine lens lies not in the extra figures on the specification sheet, but in the fact that it is calibrated at the factory to the optical path and mount of that projector series. Once installed, the image circle, edge illumination, and focusing travel are all at their designed values, so there is no need to use keystone correction to compensate for image quality.

1. Lens Specifications

Brand	Appotronics（Appotronics）
Lens Model	AL-EL300LZ Zoom
Throw Ratio	2.86-4.85:1
Product Type	Long Throw Lens (Long Throw)
Compatible Models	3 models
Warranty	12 months; after-sales service is available for damage not caused by the user, subject to the date on the shipping invoice

The above specifications are subject to the manufacturer's official specifications. Mechanical dimensions, flange focal distance, and mount type are not shown in the specification table. Please verify them with us based on the projector model. Ordering solely on the basis of 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 genuine lens is a zoom lens (2.86-4.85:1). Each image size corresponds to a range of distances, and the lens can focus at any position within that range when installed.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 6.15 – 10.43 m
120 inches	2.58 m	approx. 7.38 – 12.51 m
150 inches	3.22 m	approx. 9.22 – 15.64 m
200 inches	4.30 m	approx. 12.30 – 20.85 m

These figures represent the clear distance from the front of the lens to the screen and do not include the clearance required behind the projector for cooling and cabling. The figures are calculated for a 16:10 aspect ratio; actual installation should follow on-site measurements and the manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the near end, the image is brighter and the edges are slightly softer; toward the far end, the edges are sharper and brightness decreases slightly. Where site conditions allow, it is recommended to use the middle of the range. After installation, first use the focus ring to find the sharpest image, and then fine-tune the lens shift.

3. Compatible Models (3 models)

The following table is taken from the manufacturer's official compatibility list. Brightness and resolution are populated from the model database; where the data cannot be retrieved, “—” is shown. No values are estimated.

Model	Brightness	Resolution
AL-SU10KA	—	—
AL-SU13KA	—	—
AL-SU15KA	—	—

For models not on 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 based on a similar model is not worth taking.

Throw Ratio by Projector Series

The rated throw ratio differs when the same AL-EL300LZ Zoom is used with the series listed below. Select the value based on the series of the actual projector.

Projector Series	Throw Ratio
—	2.86-4.85:1

4. Three Checks Before Replacement

• Confirm the projector chip and resolution. Genuine 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 illumination loss after installation.
• Calculate the installation distance first. The rated throw ratio of this lens is 2.86-4.85:1. Apply the table in Section 2 to the dimensions of your venue. Fixed-focus lenses offer no adjustment margin, and zoom lenses also require 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. Genuine lenses are calibrated to the mounts of the corresponding projector series. After installation, you must hear the lock click into place. A skewed image or soft edges are usually caused by the lock not being fully engaged, not by a problem with the lens itself.

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