Christie 38-809071-01 HB Fixed Lens: D4K2560, D4K3560, Mirage 4K25, Mirage 4K35, Roadie 25K

Christie Genuine Lens 38-809071-01 HB Fixed is an OEM optical accessory for Christie professional projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 0.90:1. The official compatibility list covers 6 projector models; before installation, simply verify the projector model and panel size, with no need to improvise using an adapter ring. The value of an OEM lens lies not in the additional figures in a specification sheet, but in the fact that it is factory-calibrated to the optical path and lens mount of the corresponding projector series. Once installed, the image circle, edge illumination, and focusing travel all match their design values, eliminating the need to compensate for image quality with keystone correction.

I. Lens Specifications

Brand	Christie (Christie)
Lens Model	38-809071-01 HB Fixed
Throw Ratio	0.90:1
Product Type	Standard Throw
Compatible Models	6 projectors
Warranty	12 months; after-sales service is available for damage not caused by the user, subject to the date on the sales invoice

The above specifications are subject to the official manufacturer specifications. For mechanical dimensions, flange distance, and mount type not included in the specifications table, please contact us with the projector model. Ordering based solely on similar model numbers carries the risk that the lens will not fit.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This genuine OEM lens has a fixed focal length (0.90:1). Installation distance varies linearly with image size, with no adjustment range, so accurate measurements are essential before installation.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 1.94 m
120 inches	2.58 m	approx. 2.32 m
150 inches	3.22 m	approx. 2.90 m
200 inches	4.30 m	approx. 3.87 m

These figures represent the clear distance from the front surface of the lens to the screen and do not include clearance at the rear of the projector for cooling and cable connections. They are calculated for a 16:10 aspect ratio; actual distances are subject to on-site measurements and the manufacturer's manual.

III. Compatible Models (6 Projectors)

The following table is drawn from the official compatibility list. Brightness and resolution are populated from the model database; unavailable data is shown as “—” and no values are inferred.

Model	Brightness	Resolution
D4K2560	22500 lumens	4096x2160
D4K3560	32500 lumens	4096x2160
Mirage 4K25	—	—
Mirage 4K35	—	—
Roadie 25K	—	—
Roadie HD+30K	—	—

For compatibility with a model not on the list, send us photographs of the projector nameplate and the current lens for verification. Projector platforms from the same generation often share the same mount, but ordering based solely on model similarity is not worth the risk.

Throw Ratios for Different Projector Series

The nominal throw ratio of the same 38-809071-01 HB Fixed lens differs across the series listed below, so use the value corresponding to the actual projector series when selecting a lens.

Projector Series	Throw Ratio
—	0.90:1

IV. Three Checks Before Replacement

• Confirm the projector panel and resolution. OEM lenses are designed for a specific panel size. If the panel specifications differ, the image circle will not cover the full image, resulting in vignetting or light loss at the edges after installation.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.90:1; use the table in Section 2 to calculate the distance based on your installation site's dimensions. A fixed-focal-length lens offers no adjustment margin, and even a zoom lens requires 10–20 cm of clearance at both ends of its range.
• Check the mount and locking mechanism. OEM lenses are calibrated to the lens mount of the corresponding projector series, and you must hear the lens lock into place after installation. A skewed image or soft edges are most often caused by incomplete locking, not by the lens itself.

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