Christie 121-114107-XX Long Zoom Lens: Compatible with 23 Models

Christie Original Lens 121-114107-XX Long Zoom is a factory-supplied optical accessory for Christie professional projectors. It is a long-throw lens (Long Throw) with a throw ratio of 2.80-4.90:1. The factory model compatibility list covers 23 models. Before installation, simply verify the projector model and panel size; there is no need to improvise with adapter rings. The value of an original lens lies not in the extra figures in the specification sheet, but in the factory calibration to the optical path and mount of that projector series: once installed, the image circle, edge illumination, and focus travel all match their design values, with no need to use keystone correction to compensate for image quality.

I. Lens Specifications

The above specifications are subject to the manufacturer's published specifications. Mechanical dimensions, flange distance, and mount type not listed in the specifications table should be verified with us according to the projector model; ordering solely on the basis of a similar model carries the risk of an incompatible fit.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This original lens is a zoom lens (2.80-4.90:1). A given image size corresponds to a range of installation distances, and the lens can be focused at any distance within that range.

The distances above are clear distances from the front of the lens to the screen and do not include the space required for cooling and cable connections at the rear of the projector. They are calculated for a 16:10 image; actual values should be verified through on-site measurement and the manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the short-throw end, the image is brighter and the edges are slightly softer; toward the long-throw end, the edges are sharper and brightness decreases slightly. Where the venue allows, the middle of the range is recommended. After installation, find the sharpest position using the focus ring, then fine-tune the lens shift.

III. Compatible Projector Models (23 Models)

The table below is taken from the manufacturer's model compatibility list. Brightness and resolution have been populated from the model database; where they cannot be retrieved, “—” is shown, with no estimates made.

To verify compatibility for a model not on the list, send us photos of the projector nameplate and the existing lens—same-generation platforms often share the same mount, but ordering on the basis of a similar model is not worth the risk.

Throw Ratios by Projector Model Series

The rated throw ratio varies by series when the same 121-114107-XX Long Zoom is installed on the series listed below, so select the value based on the actual projector series.

IV. Three Checks Before Replacement

• Confirm the projector imaging chip and resolution. Original lenses are designed for a specific panel size. If the panel specification differs, the image circle cannot cover the full panel, resulting in vignetting or edge illumination loss.
• Calculate the installation distance first. This lens has a rated throw ratio of 2.80-4.90:1. Use the table in Section 2 to calculate the distance for your venue. Fixed-focus lenses provide no adjustment margin, and zoom lenses should also leave 10–20 cm of margin at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount of that projector series. After installation, you must hear the lock engage fully; a skewed image or soft edges usually indicate incomplete locking, rather than a problem with the lens itself.

If you are unsure, take one photo of the projector nameplate and one of the current lens nameplate, then send them to us. Verification against the physical items is the most reliable approach.