SC221 Projector Lens 0.85–1.37:1 for 10 Christie Installation Projectors

SC221 is a short-throw lens for 0.96-inch panels (Christie), with a 0.85–1.37:1 throw ratio and lens shift. It supports 10 models across one model series. This guide consolidates the lens specifications, installation distances, model compatibility list, and replacement considerations.

I. Lens Specifications

Lens shift is the key differentiator of this lens. Its 10% horizontal and 4% vertical shift range allows the projector to be installed off the screen centerline, with the image realigned through lens shift without relying on keystone correction. Keystone correction comes at a cost—each adjustment reduces the effective pixel count and can blur text edges. In professional installations, lens shift should always be used instead of keystone correction whenever possible; preserving image quality is essential.

II. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This zoom lens (0.85–1.37:1) covers a range of distances for a given image size and can be focused anywhere within that range during installation.

These figures represent the clear distance from the front of the lens to the screen and do not account for rear housing clearance for heat dissipation or cable connections. They are calculated for a 16:10 image; actual values should be verified on site and in the manual.

Image quality varies 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 space permits, position the projector near the middle of the range. After installation, find the sharpest setting on the focus ring, then fine-tune the lens shift—adjusting both at the same time makes precise alignment difficult.

III. Compatible Models (10 Models, Christie)

The table below is ordered from newest to oldest by model production date and lists each model’s resolution, brightness, and zoom ratio for its factory-standard lens, making it easy to identify the right option for a project.

The zoom ratio is the zoom factor of the model’s factory-standard lens (upper limit ÷ lower limit of its original 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 10 models generally have throw ratios of 1.5-2.0:1. The 0.85–1.37:1 model featured here provides an adjusted focal-length range, allowing different image sizes at the same projection distance—this is the primary reason for replacing the lens. It also retains full lens-shift capability, so the image can still be aligned after changing the focal range.

IV. Three Checks Before Replacement

• The panel size and resolution must match. This model is designed for 0.96-inch panels. Projectors with a different panel size or resolution may produce somewhat different image results, so the safest approach is to check the projector’s nameplate before installation.
• Interfaces and locking mechanism. Interfaces are generally compatible within the same platform generation, but the locking latch position varies between generations. If the image appears skewed or the edges remain soft after installation, the lock is usually not fully engaged; this is rarely an issue with the lens itself.
• Allow for lens-shift margins in the installation. The shift range provides installation flexibility, but image quality at the edges declines when shift is pushed to its limits. For practical use, keep lens shift within 70% of the stated values.

For models not listed, the safest option is to send us the projector’s nameplate and a photo of the original lens for verification—platforms of the same generation often share the same interface, but ordering based solely on a similar model name carries unnecessary risk.