Christie 108-321107-xx Zoom Long-Throw Lens: CP2210 Compatibility

Christie Original Lens 108-321107-xx Zoom is an OEM optical accessory for Christie engineering projectors, featuring a long-throw design with a throw ratio of 1.75-2.40:1. The factory compatibility list covers one projector model. Before installation, simply verify the projector model and panel size; there is no need to make do with adapter rings. The value of an original lens lies not in the extra figures in a specification sheet, but in its factory calibration to the optical path and 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.

I. Lens Specifications

The above specifications are based on the OEM specifications. For mechanical dimensions, flange distance, and mount type not shown in the specification table, please verify them with us using the projector model. Ordering directly based on a similar model carries the risk that the lens will not fit.

II. 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 (1.75-2.40:1), so the same image size corresponds to a range of installation distances, and focus can be achieved anywhere within that range.

The distances above are clear measurements from the front surface of the lens to the screen and do not include space for rear ventilation and cable connections on the projector. They are calculated for a 16:10 image; actual values should be verified by on-site measurement and in accordance with the OEM manual.

Image quality varies at the two ends of the zoom range: toward the near end, the image is brighter and the edges are slightly softer; toward the far end, the edges are sharper and the brightness is slightly lower. When venue conditions allow, placing the lens around the midpoint of the range is recommended. After installation, first find the sharpest position using the focus ring, then fine-tune the lens shift.

III. Compatible Models (1 Projector)

The table below is taken from the OEM compatibility list. Brightness and resolution are populated from the model database; unavailable values are marked “—” rather than estimated.

Whether a model outside the list is compatible must be verified by sending us photos of the projector nameplate and the existing lens. Although platforms of the same generation often share the same mount, it is not worth the risk of placing an order based solely on a similar model number.

Throw Ratios by Projector Model Series

The nominal throw ratio is not the same when the same 108-321107-xx Zoom is installed on the series listed below. Use the value for the actual projector series when selecting a lens.

IV. Three Checks Before Replacement

• Confirm the projector's imaging chip and resolution. Original lenses are designed for specific panel sizes. 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 nominal throw ratio of 1.75-2.40:1. Use the table in Section II to apply it to your venue dimensions. Fixed-focal-length lenses offer no adjustment margin, and zoom lenses should also have 10–20 cm of margin at both ends.
• Verify the mount and locking mechanism. Original lenses are calibrated to the mount of that projector series. After installation, you must hear it click into the locked position. A skewed image or soft edges are usually caused by incomplete locking, not by an issue with the lens itself.

If you are unsure, photograph the projector nameplate and the existing lens nameplate and send one photo of each to us. Checking against the actual items is the safest approach.