WE621 Projector Lens 0.5–0.6:1 for 1 Engineering Projector, incl. LG BU70QGA

The WE621 is a short-throw lens for the 0.65/0.66/0.67 panel group (LG), with a 0.5–0.6:1 throw ratio and lens shift. It is compatible with 1 projector model across 1 model series. This article presents the lens specifications, installation distances, model compatibility list, and replacement considerations all in one place.

I. Lens Specifications

Lens shift is the key differentiator of this lens. A horizontal shift range of ±35% and vertical shift range of ±10% allow the projector to be installed off the screen centerline, with the image repositioned through lens shift rather than keystone correction. Keystone correction comes at a cost—each level of correction reduces the effective pixel count and blurs text edges. In professional installations, avoid keystone correction whenever lens shift can achieve the required alignment; this is the minimum standard for image quality.

II. Calculating Installation Distance from Throw Ratio

Throw ratio is the ratio of installation distance to image width. This is a zoom lens (0.5–0.6:1), so each image size corresponds to a range of installation distances, and the lens can focus at any point within that range during installation.

The distances above are clear measurements from the front of the lens to the screen and do not allow for ventilation and cable-routing space at the rear of the chassis. They are calculated based on a 16:10 image; actual values should be verified through on-site measurements and the manual.

Image quality varies at the two ends of the zoom range: the image is brighter with slightly softer edges near the short end, while the edges are sharper with slightly lower brightness near the long end. Where installation space allows, use the middle of the range. After installation, first find the sharpest position using the focus ring, then fine-tune the lens shift—adjusting both variables at the same time makes precise alignment difficult.

III. Compatible Models (1 Model, LG)

The table below is sorted by model production date, from newest to oldest, and includes each model's resolution, brightness, and factory lens zoom ratio for quick identification based on 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 Characteristics of This Model

The factory standard lens for the 1 compatible model typically has a throw ratio within 1.53 ~ 2.45. The 0.5–0.6:1 model featured here effectively adjusts the focal range, allowing different image sizes from the same projection distance—the direct reason for replacing the lens. It also retains full lens shift capability, enabling the image to remain properly aligned after the focal range is changed.

IV. Three Checks Before Replacement

• Confirm the panel size and resolution. This model is designed for 0.67-inch panels. Projectors with different panel sizes or resolutions may show differences in projection performance, so checking the nameplate on the chassis before installation is the safest approach.
• Check the interface and locking mechanism. Platforms of the same generation generally offer good interface compatibility, but locking tab positions differ between generations. If the image appears skewed or the edges are not sharp after installation, the locking mechanism is usually not fully engaged rather than the lens itself being faulty.
• Allow for lens shift in the installation plan. The shift range provides installation flexibility, but edge quality declines at the extremes. Actual use should therefore remain within 70% of the specified shift values.

To determine whether a model not on the list is compatible, it is best to send us the chassis nameplate and photos of the original lens for verification. Same-generation platforms often share interfaces, but ordering solely because the model designation looks similar is not worth the risk.