WA105 Projector Lens 0.75:1 for 3 Diheng Models: DU26K, DU22K, DU21K

The WA105 is a short-throw lens for 0.96-inch panels (Diheng), featuring a 0.75:1 throw ratio and lens shift. It is compatible with 3 models from 1 model series. This article presents the lens specifications, installation distances, model compatibility list, and key replacement considerations in one place.

I. Lens Specifications

Lens-shift capability is the key differentiator of this lens. The shift ranges of 21.00% horizontally and 8.20% vertically allow the projector to be installed off the screen centerline and the image to be shifted back into alignment without using keystone correction. Keystone correction comes at a cost—each adjustment step loses some actual pixels and makes text edges appear blurred. In professional installations, never resort to keystone correction when lens shift can solve the issue; this is the minimum standard for image quality.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This lens has a fixed focal length (0.75:1), so the installation distance varies linearly with image size and offers no adjustment margin. Accurate measurements are therefore 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 cable connections. They are calculated for a 16:10 image; actual values must be verified by on-site measurement and the manual.

III. Compatible Models (3 Models, Diheng)

The table below is sorted by production date, from newest to oldest, and includes each model's resolution, brightness, and factory-lens zoom ratio to help you quickly identify the right option for your project requirements.

The zoom ratio is the zoom factor of the model's factory-standard lens (upper limit ÷ lower limit of the factory throw-ratio range), not the zoom range of the lens featured in this article.

Common Features of These Models

The throw ratios of the factory-standard lenses for these 3 models generally fall within 1.5~2.0. The 0.75:1 ratio of the model featured here effectively changes the focal-length range, allowing the same projection distance to produce a different image size—the direct reason for replacing the lens. It also retains the full lens-shift capability, so the image can still be aligned after the focal length is adjusted.

IV. Three Checks Before Replacement

• The panel and resolution must match. This model is designed for 0.96-inch panels. Projectors with different panel sizes or resolutions may show variations in projection performance, so the safest approach is to check the nameplate on the projector body before installation.
• Check the interfaces and locking mechanism. Interfaces generally offer good compatibility across platforms of the same generation, but the locking latch position varies by generation. If the image appears skewed or the edges look soft after installation, the lock is usually not fully engaged rather than the lens itself being faulty.
• Account for the lens-shift margin in the installation. The shift range provides installation flexibility, but edge image quality declines when it is pushed to the limit. For actual use, keep operation within 70% of the specified value.

To determine whether a model outside the list can be used, send us a photo of the projector nameplate and the original lens for verification. Platforms of the same generation often share the same interface, but ordering solely because the model numbers look similar is not worth the risk.