Appotronics XL380LA Telephoto Zoom Lens Guide

Appotronics Genuine Lens XL380LA Telephoto Zoom is an official optical accessory for Appotronics professional projectors. It is a long-throw (Long Throw) lens with a throw ratio of 3.80-6.80:1. The manufacturer’s compatibility list covers 6 models. Before installation, simply verify the projector model and panel size; no adapter ring workaround is needed. The value of a genuine lens lies not in the additional figures on a specification sheet, but in its factory calibration to the optical path and mount of that projector series. Once installed, the image circle, edge illumination, and focus travel all meet the design specifications, eliminating the need to use keystone correction to compensate for image quality.

1. Lens Specifications

Brand	Appotronics（Appotronics）
Lens Model	XL380LA Telephoto Zoom
Throw Ratio	3.80-6.80:1
Product Type	Long Throw
Compatible Models	6 models
Warranty	12 months; after-sales service is available for damage not caused by the user, based on the date on the dispatch receipt

The above specifications are subject to the manufacturer’s official specifications. Mechanical dimensions, flange distance, and mount type are not listed in the specification table. Please contact us with the projector model for verification. Ordering solely because the model numbers appear similar carries the risk that the lens will not fit.

2. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This genuine lens is a zoom lens (3.80-6.80:1), so a given image size corresponds to a range of installation distances. Focus can be achieved at any distance within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 8.17 – 14.62 m
120 inches	2.58 m	Approx. 9.80 – 17.54 m
150 inches	3.22 m	Approx. 12.25 – 21.93 m
200 inches	4.30 m	Approx. 16.34 – 29.24 m

These figures represent the clear distance from the front of the lens to the screen and do not include space behind the projector for cooling and cable connections. They are calculated for a 16:10 image; actual distances must be confirmed through on-site measurements and the manufacturer’s manual.

Image quality varies at the two ends of the zoom range. At the short-throw end, the image is brighter and the edges are slightly softer; at the long-throw end, the edges are sharper and brightness is slightly lower. Where the venue allows, use the midpoint of the range. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

3. Compatible Models (6 Models)

The following table is taken from the manufacturer’s compatibility list. Brightness and resolution are populated from the model database; entries that cannot be verified are marked “—” without making assumptions.

Model	Brightness	Resolution
SK11KAS	—	—
SK13KAS	—	—
SK15KAS	—	—
SU11KAS	—	—
SU13KAS	—	—
SU15KAS	—	—

To verify compatibility with a model not included in the list, please send us a photo of the projector nameplate and the existing lens. Platforms from the same generation often share the same mount, but ordering based solely on similar model numbers is not worth the risk.

Throw Ratios for Different Model Series

The nominal throw ratio varies by series when the same XL380LA Telephoto Zoom lens is installed. Select the value based on the series of the actual projector.

Model Series	Throw Ratio
—	3.80-6.80:1

4. Three Checks Before Replacement

• Check the projector chipset 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 light loss at the edges.
• Calculate the installation distance first. This lens has a rated throw ratio of 3.80-6.80:1. Use the table in Section 2 to calculate the distance for your installation space. Fixed-focus lenses provide no adjustment margin, while zoom lenses require 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. The genuine lens is calibrated to the mount for that projector series. After installation, you must hear the lock engage fully. A skewed image or soft edges are usually caused by the lock not being fully engaged rather than by a problem 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 equipment is the most reliable approach.