Christie 129-109101-XX HB Zoom Long-Throw Projector Lens: 7 Compatible Models

Christie Genuine Lens 129-109101-XX HB Zoom is an original optical accessory for Christie professional projectors. It is a long-throw (Long Throw) lens with a 3.89-5.43:1 throw ratio. The factory compatibility list covers 7 models; before installation, simply verify the projector model and panel size without resorting to adapter rings. The value of a genuine lens lies not in the extra figures in a specification sheet, but in its factory calibration to the optical path and lens mount of that projector series. Once installed, the image circle, edge illumination, and focus travel are all at their design values, so there is no need to use keystone correction to compensate for image quality.

1. Lens Specifications

These specifications are subject to the manufacturer's original specifications. For mechanical dimensions, flange distance, and mount type not shown in the specification table, please contact us with your projector model for verification. Placing an order solely because the model appears 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 genuine lens is a zoom lens (3.89-5.43:1). A given image size corresponds to a range of distances, and the lens can be focused anywhere within that range during installation.

These distances represent the clear gap from the front surface of the lens to the screen and do not allow for cooling and cable-routing space at the rear of the projector. Figures are calculated for a 16:10 image; actual distances should be verified by on-site measurement and according to 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 near end, while the edges are sharper and brightness slightly lower toward the far end. Where the venue allows, use the middle of the range. After installation, first find the sharpest image using the focus ring, then fine-tune the lens shift.

3. Compatible Models (7 Units)

The following table is taken from the factory compatibility list. Brightness and resolution have been populated from the model database; entries that could not be obtained are marked “—” and have not been estimated.

To check whether a model outside the list is compatible, please send us photos of the projector nameplate and the existing lens. 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 Ratios by Model Series

The nominal throw ratio varies by series when the same 129-109101-XX HB Zoom is installed. Use the value for the series of the actual projector when selecting the lens.

4. Three Checks Before Replacement

• Confirm the projector chip and resolution. The original lens is designed for a specific panel size. If the panel specification differs, the image circle cannot cover the image, resulting in vignetting or light loss at the edges.
• Calculate the installation distance first. This lens has a rated throw ratio of 3.89-5.43:1. Apply the table in Section 2 to your venue dimensions; a fixed-focal-length lens offers no adjustment margin, and a zoom lens should still have 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the lens mount of that projector series, and you must hear it 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 physical units is the safest approach.