WD581 0.35:1 Projector Lens for 5 Appotronics Models: AL-FU715, FU10K, FU805, FU705, FU905

WD581 is a short-throw lens for the Appotronics 0.65/0.66/0.67 panel group, with a 0.35:1 throw ratio. It is compatible with 5 models in 1 model series. This guide consolidates the lens specifications, installation distances, model compatibility list, and replacement considerations.

I. Lens Specifications

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This is a prime lens (0.35:1), so the installation distance varies linearly with image size and offers no zoom adjustment. Accurate measurements are essential before installation.

These distances represent the clear distance from the front of the lens to the screen and do not include clearance behind the chassis for heat dissipation and cabling. Calculated for a 16:10 image; actual distances should be verified on site and against the manual.

III. Compatible Models (5 Models, Appotronics)

The table below is arranged by model production date, from newest to oldest, and includes each model’s resolution, brightness, and standard lens zoom ratio for quick selection according to project requirements.

Common Traits of These Models

The throw ratios of the standard lenses supplied with these 5 models vary by lens. The 0.35:1 model featured in this guide provides a different focal-length range, allowing different image sizes from the same projection distance—the direct reason for replacing the lens. It also retains full lens-shift capability, allowing image alignment even after the focal range is changed.

IV. Three Checks Before Replacement

• Confirm the panel and resolution match. This model is designed for 0.67-inch panels. Projectors with different panel sizes or resolutions may display differences in projection performance, so it is safest to verify the specifications against the projector nameplate before installation.
• Check the interface and locking mechanism. Interfaces are generally interchangeable within the same platform generation, but locking tab positions differ between generations. If the image appears skewed or the edges look soft after installation, the locking mechanism is usually not fully engaged; this is not necessarily a lens defect.
• A prime lens has no zoom adjustment. Image size can only be changed by moving the projector. The venue dimensions must be measured accurately in advance, with an additional 10–20 cm allowed at the endpoints.

For compatibility with models not listed here, it is safest to send us photographs of the projector nameplate and original lens for verification. Models on the same platform generation often share the same interface, but ordering solely because of a similar model number carries unnecessary risk.