Christie 129-108100-XX HB Zoom Long-Throw Lens Guide: 7 Compatible Models

Christie OEM Lens 129-108100-XX HB Zoom is an original optical accessory for Christie professional projectors. It is a long-throw lens with a 2.71-3.89:1 throw ratio. The factory compatibility list covers 7 models. Before installation, simply verify the projector model and panel size—no adapter rings or improvised workaround are needed. The value of an OEM lens lies not in the extra figures on a specification sheet, but in the factory calibration of the optical path and mount for that projector series. Once installed, image circle coverage, edge illumination, and focus travel are all delivered at their designed values, eliminating the need to use keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the original manufacturer’s specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please contact us with your projector model. Placing an order solely because the model is similar carries the risk that the lens will not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This OEM lens is a zoom lens (2.71-3.89:1), so a given image size corresponds to a range of installation distances. The lens can be focused at any distance within that range.

The above distances are the clear distances from the front of the lens to the screen and do not account for clearance required for rear projector cooling and cable connections. The calculations are based on a 16:10 image; actual values are subject to on-site measurements and the manufacturer’s manual.

Image quality varies at the two ends of the zoom range: the image is brighter and the edges slightly softer toward the short-throw end; toward the long-throw end, the edges are sharper and brightness decreases slightly. When site conditions allow, the middle of the range is recommended. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

3. Compatible Models (7 Models)

The table below is taken from the OEM compatibility list. Brightness and resolution are populated from the model database; entries that cannot be verified are shown as “—,” with no assumptions made.

To verify whether a model not listed here is compatible, send us photos of the projector nameplate and the existing lens nameplate. Platforms of the same generation often share the same mount, but the risk of ordering based solely on a similar model is not worth taking.

Throw Ratio by Model Series

The same 129-108100-XX HB Zoom can be installed on the series listed below, but the rated throw ratio differs. Select the value based on the series of the actual projector.

4. Three Checks Before Replacement

• Confirm the projector chip and resolution. OEM lenses are designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the full image, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 2.71-3.89:1. Use the table in Section 2 to calculate the distances for your venue. A fixed-focus lens provides no adjustment margin, and even a zoom lens requires 10–20 cm of clearance at both ends of the range.
• Verify the mount and locking mechanism. OEM lenses are calibrated to the mount of the applicable projector series, and you must hear the lens lock into place after installation. A skewed image or soft edges are usually caused by incomplete locking rather than a problem with the lens itself.

If you are unsure, take one photo each of the projector nameplate and the existing lens nameplate and send them to us. Verification against the actual hardware is the safest approach.