Optoma BX-CAA01 Short Zoom Standard Throw Projector Lens: Compatible with 12 Models Including

Optoma Original Lens BX-CAA01 Short Zoom is a genuine optical accessory for Optoma installation projectors, belonging to the standard throw category, with a throw ratio of 0.95-1.22:1. The original compatibility list covers 12 models; before installation, simply verify against the projector model and panel size — no adapter rings needed. The value of an original lens isn't in a few extra rows of numbers on a spec sheet, but in the fact that it is calibrated at the factory to the optical path and mount of that series' chassis: once installed, the image circle, edge illumination, and focus travel all match design values, so you don't need keystone correction to compensate for image quality.

1. Lens Specifications

Brand	Optoma
Lens Model	BX-CAA01 Short Zoom
Throw Ratio	0.95-1.22:1
Product Type	Standard Throw
Compatible Models	12
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 mount type not shown in the spec table, please verify with us against your projector model — ordering based on similar model numbers 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 (0.95-1.22:1), so a given image size corresponds to a range of distances; installation anywhere within this range will achieve focus.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 2.04 – 2.62 m
120 inches	2.58 m	Approx. 2.45 – 3.15 m
150 inches	3.22 m	Approx. 3.06 – 3.93 m
200 inches	4.30 m	Approx. 4.08 – 5.25 m

The above figures are the clear distance from the lens front to the screen, excluding rear ventilation and cabling space behind the projector. 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 (12)

The table below is taken from the original 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
ZU1100	11000 lumens	WUXGA,1920 x 1200
ZU1300	13000 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 this list, please send us the projector nameplate and a photo of the existing lens for verification — same-generation platforms often share mounts, but ordering based on similar model numbers is a risk not worth taking.

Throw Ratios Across Model Series

The same BX-CAA01 Short Zoom mounted on the following series does not have the same nominal throw ratio; selection should be based on the actual series of the projector.

Model Series	Throw Ratio
—	0.95-1.22:1

4. Three Things to Confirm Before Replacement

• Confirm the projector chip and resolution. The original lens is designed for a specific panel size; 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 0.95-1.22:1; use the table in Section 2 to map it to your venue dimensions. Fixed-focus lenses have no margin, and even with zoom you should allow 10–20 cm at both ends.
• Check the mount and locking. The original lens is calibrated to the mount of that series' chassis; after installation you must hear it lock into place. Image skew or soft edges are usually due to incomplete locking, not a problem with 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.