Appotronics EL300LZ Zoom Long Throw Lens: Fits AL-FU10KA AL-FU13KA AL-FU650A AL-FU720A and 6 More

Appotronics Genuine Lens EL300LZ Zoom is an OEM optical accessory for Appotronics professional projectors. It is a long-throw lens (Long Throw) with a throw ratio of 2.86-4.85:1. The OEM compatibility list covers 10 models; before installation, simply verify the projector model and panel size, with no need for an adapter-ring workaround. The value of an OEM lens lies not in extra figures in the specification table, but in the fact that it is calibrated at the factory to the optical path and lens mount of that model series. Once installed, image-circle coverage, edge illumination, and focus travel all meet their design specifications, so there is no need to use keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the manufacturer's official specifications. For mechanical dimensions, flange distance, and lens mount type not shown in the specification table, please provide your projector model so that we can verify the details. Ordering solely on the basis of a similar model risks a lens that will not fit.

2. Converting Throw Ratio to Installation Distance

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), so a given image size corresponds to a range of distances; the lens can be focused anywhere within that range during installation.

These are net distances from the front surface of the lens to the screen and do not include space behind the projector for heat dissipation and cable connections. They are calculated for a 16:10 aspect ratio; actual values should be verified through on-site measurements and the manufacturer's manual.

Image quality varies 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 is slightly lower. If space permits, use the middle of the range; after installation, first set the focus ring to the sharpest position, and then fine-tune the lens shift.

3. Compatible Projector Models (10 Models)

The following table is taken from the OEM compatibility list. Brightness and resolution have been filled in from the model database; unavailable values are shown as — and are not estimated.

To check whether a model not on the list is compatible, please send us photos of the projector nameplate and the existing lens for verification. Same-generation platforms often share the same mount, but ordering based solely on a similar model is not worth the risk.

Throw Ratios by Projector Model Series

The nominal throw ratio varies among the following model series when the same EL300LZ Zoom is installed; choose the value according to the actual projector series.

4. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution.OEM lenses are designed for a specific panel size. If the panel specifications differ, the image circle cannot provide full coverage, causing vignetting or light loss at the edges after installation.
• Calculate the installation distance first.This lens has a rated throw ratio of 2.86-4.85:1. Use the table in Section 2 to calculate the distance for your venue; a fixed-focus lens offers no adjustment margin, and even a zoom lens should allow 10–20 cm of margin at both ends.
• Verify the lens mount and locking mechanism.The OEM lens is calibrated to the mount of that projector series. After installation, you must hear it lock into place. Image skew or soft edges are usually caused by incomplete locking rather than a fault with the lens itself.

If you are uncertain, photograph the projector nameplate and the existing lens nameplate, and send one photo of each to us. Verification against the actual hardware is the safest approach.