WB371 Projector Lens 0.74–0.77:1 for 2 Christie Models: 4K7-HS and 4K10-HS

WB371 is a short-throw lens for the 0.65/0.66/0.67 panel group (Christie), with a throw ratio of 0.74–0.77:1 and lens shift. It is compatible with 2 projector models across 1 model series. This guide consolidates the lens specifications, installation distances, model compatibility list, and replacement considerations.

I. 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 the screen's central axis and the image repositioned through lens shift without resorting to keystone correction. Keystone correction comes at a cost—each adjustment step sacrifices some effective pixels, softening text edges. In professional installations, lens shift should always be used in place of keystone correction whenever possible; this is the baseline for image quality.

II. Converting Throw Ratio to Installation Distance

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 the lens can focus at any distance within that range.

These figures represent the clear distance from the front of the lens to the screen and do not include clearance behind the chassis for heat dissipation or cable connections. They are calculated for a 16:10 image; actual values are subject to on-site measurements and the manual.

Image quality varies at the two ends of the zoom range: the image is brighter and the edges are slightly softer near the short end, while the edges are sharper and brightness is slightly lower near the long end. When site conditions allow, use the middle of the range. After installation, first find the sharpest image using the focus ring, then fine-tune the lens shift—adjusting both at once makes precise alignment difficult.

III. Compatible Projector Models (2 Models, Christie)

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

Common Features of These Models

For both models, the factory-standard lens throw ratios are generally listed as Depends on the lens. The 0.74–0.77:1 ratio of the lens featured in this article effectively adjusts 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.

IV. Three Checks Before Replacement

• The panel and resolution must match. This model is compatible with a 0.67-inch panel. Projectors with different panel sizes or resolutions will vary somewhat in projection performance; the safest approach is to verify the specifications against the chassis nameplate before installation.
• Check the interface and locking mechanism. Interface compatibility is generally good within the same platform generation, but the locking latch position differs between generations. If the image is skewed or the edges are not sharp after installation, the locking mechanism usually has not engaged fully rather than the lens itself being defective.
• Allow for lens shift margin in the installation plan. The shift range provides installation flexibility, but edge image quality degrades at the extremes; in practice, keep actual use within 70% of the rated value.

For models outside the list, it is safest to send us the chassis nameplate and photos of the original lens for verification. Platforms of the same generation often share interfaces, but the risk of placing an order based solely on a similar model number is not worth taking.