WE29D 0.5–0.6:1 Projector Lens for 4 Christie Models: 4K860-iS, DWU960-iS, DWU860-iS, DWU760-iS

WE29D is a short-throw lens designed for the Christie 0.65/0.66/0.67 panel group, with a 0.5–0.6:1 throw ratio and lens shift. It is compatible with 4 projector models across 1 model series. This guide sets out 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. Its horizontal shift of ±35% and vertical shift of ±10% allow the projector to be installed off the screen's center axis, with lens shift bringing the image back into alignment without keystone correction. Keystone correction comes at a cost—each adjustment step reduces the effective pixel count and can blur text at the edges. In professional installations, never resort to keystone correction when lens shift can resolve the issue; this is the baseline 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 is a zoom lens (0.5–0.6:1), so each image size corresponds to a range of installation distances, and the lens can be focused at any point within the appropriate range.

These figures represent the clear distance from the front surface of the lens to the screen, excluding clearance for cooling and cabling at the rear of the projector. They are calculated for a 16:10 image; verify actual distances on site and against the manual.

Image quality differs at the two ends of the zoom range: near the short-throw end, the image is brighter and the edges are slightly softer; near the long-throw end, the edges are sharper and brightness is slightly lower. Where site conditions allow, position the projector near the middle of the range. After installation, find the sharpest setting on the focus ring first, then fine-tune the lens shift—adjusting both at the same time makes it difficult to pinpoint the optimum.

III. Compatible Models (4 Models, Christie)

The table below is arranged from newest to oldest by model production date and includes each model's resolution, brightness, and zoom ratio for the factory-supplied lens, enabling quick selection according to project requirements.

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

Common Features of These Models

The factory-standard lenses for these 4 models mostly fall within the 1.25-2.0:1 throw-ratio range. The model featured here has an effective throw range of 0.5–0.6:1, enabling different image sizes at the same projection distance—the direct reason for replacing the lens. It also retains full lens-shift capability, so the image can still be aligned after the change in focal range.

IV. Three Checks Before Replacement

• Confirm that the panel size and resolution match. This model is designed for a 0.67-inch panel. Projectors with different panel sizes or resolutions will vary in projection performance, so checking the chassis nameplate before installation is the safest approach.
• Check the interface and locking mechanism. Interfaces are generally compatible within the same platform generation, but the locking-tab position varies between generations. If the image is skewed or the edges are not sharp after installation, the latch is usually not fully engaged rather than the lens itself being faulty.
• Allow for lens-shift headroom in the installation plan. The shift range provides installation flexibility, but edge image quality declines when the shift is pushed to its limits; in practice, keep actual usage within 70% of the rated values.

If you are considering using a model not on the list, send us the chassis nameplate and a photo of the original lens for verification. Same-generation platforms often share interfaces, but it is not worth the risk of placing an order based solely on a similar model designation.