Christie 129-106108-XX HB Zoom Long-Throw Projector Lens: Compatible with D4K2560, D4K3560

Christie Original Lens 129-106108-XX HB Zoom is a genuine optical accessory for Christie large-venue projectors, belonging to the long-throw category with a throw ratio of 1.63-2.17:1. The factory compatibility list covers 7 projector models; simply verify against your chassis model and panel size before installation—no adapter rings needed. The value of an original lens isn't a few extra rows of numbers on a spec sheet, but the fact that it is calibrated at the factory to the optical path and bayonet of that chassis series: once mounted, the image circle, edge illumination, and focus travel all match design values, so you won't need 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 focal distance, and bayonet type not shown in the spec table, please verify with us against your chassis model—ordering based on model similarity alone carries the risk of incompatibility.

2. Converting Throw Ratio to Installation Distance

Throw ratio is the ratio of installation distance to image width. This original lens is a zoom lens (1.63-2.17:1), so the same image size corresponds to a range of distances; as long as installation falls within this range, focus can be achieved.

The above figures are the clear distance from the lens face to the screen, excluding rear ventilation and cabling space behind the chassis. Calculated for 16:10 aspect ratio; actual values are subject to on-site measurement and the original manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the near end the image is brighter with slightly softer edges; toward the far end the edges are sharper with slightly reduced brightness. Where space permits, we recommend landing in the middle of the range; after installation, first find the sharpest position on the focus ring, then fine-tune the shift.

3. Compatible Models (7)

The table below is taken from the original manufacturer's compatibility list; brightness and resolution are filled in from the model database, with "—" where unavailable—no speculation.

To check whether models outside this list are usable, please send us photos of the chassis nameplate and the existing lens for verification—same-generation platforms often share bayonets, but the risk of ordering based on model similarity isn't worth it.

Throw Ratios Across Model Series

The same 129-106108-XX HB Zoom mounted on the following series does not carry the same nominal throw ratio; selection must use the value for the actual chassis series.

4. Three Things to Confirm Before Replacement

• Confirm the chassis chip and resolution. Original lenses are designed for specific panel sizes; with a different panel specification the image circle cannot cover it, resulting in vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 1.63-2.17:1; use the table in Section 2 to map it to your venue dimensions. Prime lenses have no margin, and even with zoom you should allow 10–20 cm at both ends.
• Verify the bayonet and locking. Original lenses are calibrated to the chassis bayonet of that series; after mounting you must hear it lock into place. Image skew and soft edges are mostly due to incomplete locking, not the lens itself.

If unsure, take one photo each of the chassis nameplate and the existing lens nameplate and send them to us—verifying against the actual hardware is the safest approach.