Optoma BX-CAA03 Long Zoom Telephoto Projector Lens: Compatible with TW865-NL, TW865-NLW, WU630

Optoma Original Lens BX-CAA03 Long Zoom is a genuine optical accessory for Optoma installation projectors, belonging to the long-throw category, with a throw ratio of 1.52-2.92:1. The original compatibility list covers 10 projector models; before installation, simply verify against the projector model and panel size — no adapter rings needed. The value of an original lens isn't a few extra rows of numbers on a spec sheet, but that it is calibrated at the factory to the optical path and bayonet of that series' chassis: once mounted, the image circle, edge illumination, and focus travel are all at their design values, so you don't need keystone correction to compensate for image quality.

1. Lens Specifications

Brand	Optoma (Optoma)
Lens Model	BX-CAA03 Long Zoom
Throw Ratio	1.52-2.92:1
Product Type	Long Throw
Compatible Models	10 units
Warranty	12 months; after-sales service available for non-human damage, based on the date on the shipping document

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 the projector 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 (1.52-2.92:1), so the same image size corresponds to a range of distances; as long as installation falls within this range, focus can be achieved.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 3.27 – 6.28 m
120 inches	2.58 m	Approx. 3.92 – 7.53 m
150 inches	3.22 m	Approx. 4.90 – 9.42 m
200 inches	4.30 m	Approx. 6.54 – 12.56 m

The above figures are the clear distance from the lens face to the screen, excluding rear ventilation and cabling space. 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, it is recommended to land 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 (10 units)

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.

Model	Brightness	Resolution
TW865-NL	6000 lumens	1280x800
TW865-NLW	6000 lumens	1280x800
WU630	6000 lumens	1920x1200
ZU1050	10000 lumens	WUXGA,1920 x 1200
ZU650	5500 lumens	1920x1200
ZU650+	5500 lumens	1920x1200
ZU660	6000 lumens	1920x1200
ZU750	7500 lumens	WUXGA,1920 x 1200
ZU850	8500 lumens	WUXGA,1920 x 1200
ZU860	8500 lumens	WUXGA,1920 x 1200

For models outside the list, please send us photos of the projector 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 Ratio Across Model Series

The same BX-CAA03 Long Zoom mounted on the following series has different nominal throw ratios; selection should be based on the actual series of the projector.

Model Series	Throw Ratio
—	1.52-2.92:1

4. Three Things to Confirm Before Replacement

• Confirm the projector chip and resolution. Original lenses are designed for specific panel sizes; if the panel specifications differ, 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 1.52-2.92:1; use the table in Section 2 to map it to your venue dimensions. Prime lenses have no margin, and even with zoom, allow 10–20 cm at both ends.
• Check the bayonet and locking. Original lenses are calibrated to the bayonet of that series' chassis; after installation, you must hear it lock into place. Skewed images and soft edges are mostly due to incomplete locking, not the lens itself.

If unsure, take a photo of the projector nameplate and the existing lens nameplate and send them to us — verification against the actual hardware is the safest approach.