Appotronics XL053FR Short Zoom Short-Throw Projector Lens: SK11KAS SK13KAS SK15KAS SU11KAS SU13KAS

Appotronics Original Lens XL053FR Short Zoom is a genuine optical accessory for Appotronics engineering projectors. It is a short-throw lens with a throw ratio of 0.53-0.63:1. The factory compatibility list covers 6 projector models; before installation, simply verify against the projector model and panel size—no adapter rings needed. The value of an original lens isn't in a few extra rows of specs, 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 focus travel all match design values, so you don't need keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange focal distance, and mount type not shown in the spec table, please verify with us against your projector model—ordering based on model similarity alone carries the risk of incompatibility.

2. Converting Throw Ratio to Installation Distance

Throw ratio is the ratio of installation distance to image width. This original lens is a zoom lens (0.53-0.63:1), so the same image size corresponds to a range of distances; installation anywhere within this range will achieve focus.

The above are clear distances from the lens face to the screen, excluding rear ventilation and cabling space behind the projector. Calculated for 16:10 aspect ratio; actual values are subject to on-site measurement and the original manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the near end the image is brighter with slightly softer edges; toward the far end the edges are sharper with slightly reduced brightness. Where space permits, we recommend positioning in the middle of the range; after installation, first find the sharpest point on the focus ring, then fine-tune the shift.

3. Compatible Models (6)

The table below is taken from the original manufacturer's compatibility list; brightness and resolution are filled in from the model database, with "—" where unavailable—no speculation.

To check whether models outside this list are compatible, please send us photos of the projector nameplate and the existing lens for verification—same-generation platforms often share mounts, but ordering based on model similarity alone isn't worth the risk.

Throw Ratios Across Model Series

The same XL053FR Short Zoom mounted on the following series has different nominal throw ratios; selection should be based on the actual series of your projector.

4. Three Things to Confirm Before Replacement

• Confirm the projector chip and resolution. Original lenses are designed for specific panel sizes; if the panel specification differs, the image circle cannot cover it, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.53-0.63:1; use the table in Section 2 to determine the distance for your venue dimensions. Fixed-focus lenses have no margin, and even zoom lenses need 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. Original lenses are calibrated to the mount of that projector series; after installation you must hear the lock engage. Image skew or soft edges are usually caused by incomplete locking, not by the lens itself.

If unsure, take a photo of the projector nameplate and the existing lens nameplate and send them to us—verification against the actual hardware is the safest approach.