WB281 Projector Lens 0.74–0.77:1 for 1 Winmate Engineering Projector, Including C-4K1200

WB281 is a short-throw lens for the 0.65/0.66/0.67 panel group (Wincent), with a 0.74–0.77:1 throw ratio and lens shift. It is compatible with 1 model from 1 model series. This article presents the lens specifications, installation distances, model compatibility list, and key replacement considerations in one place.

1. Lens Specifications

Lens-shift capability is the key differentiator of this lens. A shift range of 70.30% horizontally and 32% vertically allows the projector to be installed off-center from the screen’s central axis. The image can then be repositioned using lens shift without relying on keystone correction. Keystone correction comes at a cost—each adjustment sacrifices some effective pixels and makes text edges appear blurred. In professional installations, lens shift should always be used instead of keystone correction whenever possible, as this is essential to image quality.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This is a zoom lens (0.74–0.77:1), so each image size corresponds to a range of distances, and focus can be achieved anywhere within that range during installation.

The values above are clear distances from the front of the lens to the screen and do not include clearance behind the projector for ventilation and cabling. These values are based on a 16:10 image; actual measurements and the manual take precedence.

Image quality differs at the two ends of the zoom range: images are brighter with slightly softer edges near the close end, while edges are sharper and brightness is slightly lower near the far end. When the venue allows, use the middle of the range. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift—adjusting both variables at once makes precise alignment difficult.

3. Compatible Models (1 Model, Wincent)

The table below is ordered by model production date, from newest to oldest, and lists each model’s resolution, brightness, and factory lens zoom ratio for quick identification based on project requirements.

Common Features of This Model

The factory-standard lens throw ratio for this model is generally listed as Depends on the lens. The 0.74–0.77:1 ratio of the model discussed in this article represents an adjustment to the focal range, allowing different image sizes at the same projection distance—this is the direct reason for replacing the lens. It also retains full lens-shift capability, so the image can still be aligned after the focal range is adjusted.

4. Three Checks Before Replacement

• Confirm the panel size and resolution. This model is compatible with 0.67-inch panels. Projectors with a different panel size or resolution will have different projection performance; checking the chassis nameplate before installation is the safest approach.
• Check the interfaces and locking mechanism. Interfaces are generally compatible within the same platform generation, but locking latch positions vary between generations. If the image appears skewed or the edges are not sharp after installation, the lock is usually not fully engaged rather than the lens itself being faulty.
• Factor lens-shift margin into the installation. The shift range provides some installation flexibility, but edge image quality declines at the extreme. Actual use should be kept within 70% of the rated value.

For models not included in the list, it is safer to send us the chassis nameplate and a photo of the original lens for verification. Platforms of the same generation often share the same interfaces, but placing an order based solely on a similar model designation is not worth the risk.