Appotronics AL-EL470TZ Zoom Long-Throw Lens Guide: AL-SU10KA AL-SU13KA AL-SU15KA

Appotronics Original Lens AL-EL470TZ Zoom is an original optical accessory for Appotronics professional projectors. It is a long-throw lens (Long Throw) with a throw ratio of 4.68-7.96:1. The manufacturer's official compatibility list covers 3 projector models; before installation, simply verify the projector model and panel size, with no need to resort to adapter rings. The value of an original lens lies not in the extra figures in the specification sheet, but in the fact that its optical path and mount are calibrated at the factory for that projector series. Once installed, the image circle, edge illumination, and focus travel all meet their design values, so there is no need to use keystone correction to compensate for image quality.

1. Lens Specifications

The manufacturer's official specifications take precedence. For mechanical dimensions, flange distance, and mount type not listed in the specification table, please contact us with the exact projector model for verification. Placing an order solely because the model numbers are similar 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 original lens is a zoom lens (4.68-7.96:1). A given image size corresponds to a range of installation distances, and focus can be achieved anywhere within that range.

These figures represent the clear distance from the front face of the lens to the screen, excluding the space required for cooling and cable connections at the rear of the projector. They are calculated for a 16:10 image format; actual values should be confirmed through on-site measurements and the manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the short-throw end, the image is brighter and the edges are slightly softer; toward the long-throw end, the edges are sharper and brightness is slightly lower. Where the installation space allows, we recommend placing the projector around the middle of the range. After installation, use the focus ring to find the sharpest image, then fine-tune the lens shift.

3. Compatible Projector Models (3 Models)

The table below is taken from the manufacturer's official compatibility list. Brightness and resolution have been populated from the model database; where the data is unavailable, “—” is shown, with no estimates made.

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

Throw Ratios by Projector Model Series

The nominal throw ratio varies when the same AL-EL470TZ Zoom lens is used with the following series. Select the value based on the series of the actual projector.

4. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution. Original 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 after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 4.68-7.96:1. Use the table in Section 2 to calculate the distance for your venue. A fixed-focus lens offers no adjustment margin, while a zoom lens still requires 10–20 cm of adjustment at both ends.
• Verify the mount and locking mechanism. Original lenses are calibrated to the mount of the corresponding projector series. After installation, you must hear the lens click into the locked position. A skewed image or soft edges are usually caused by incomplete locking, not by the lens itself.

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