BenQ LS2ST3 Wide Fixed Short-Throw Lens for LU9235 and PX9230

BenQ Original Lens LS2ST3 Wide Fixed is an original optical accessory for BenQ professional projectors. It is a short-throw lens (Short Throw) with a throw ratio of 0.78:1. The official compatibility list covers 2 projector models. Before installation, simply verify the projector model and panel size; there is no need to make do with an adapter ring. The value of an original lens lies not in the extra figures it adds to the specification sheet, but in the fact that it is calibrated at the factory to the optical path and mount of that projector series. Once installed, the image circle, edge illumination, and focusing travel are all at their design values, so there is no need to use keystone correction to compensate for image quality.

I. Lens Specifications

Brand	BenQ (BenQ)
Lens Model	LS2ST3 Wide Fixed
Throw Ratio	0.78:1
Product Type	Short-throw lens (Short Throw)
Compatible Models	2 models
Warranty	12 months; after-sales service is available for damage not caused by the user, based on the date on the shipping invoice

The above specifications are subject to the official manufacturer specifications. For mechanical dimensions, flange distance, and mount type not shown in the table, please contact us with the projector model for verification. Ordering directly based on a similar model name 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 original lens is fixed-focus (0.78:1), so the installation distance varies linearly with the image size, with no room for adjustment. Accurate measurements are essential before installation.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 1.68 m
120 inches	2.58 m	approx. 2.01 m
150 inches	3.22 m	approx. 2.52 m
200 inches	4.30 m	approx. 3.35 m

The values above represent the clear distance from the front face of the lens to the screen and do not account for ventilation behind the projector or space for cable connections. They are calculated for a 16:10 image; the actual installation should be verified on site and according to the manufacturer's manual.

III. Compatible Models (2 Models)

The table below is taken from the official compatibility list. Brightness and resolution are populated from the model database; values that cannot be obtained are shown as "—", with no assumptions made.

Model	Brightness	Resolution
LU9235	6000 lumens	1920x1200
PX9230	6000 lumens	1024x768

To verify whether a model outside the list can be used, please send us photos of the projector nameplate and the existing lens—projector platforms from the same generation often share the same mount, but ordering based only on a similar model name is not worth the risk.

Throw Ratios for Different Model Series

The rated throw ratio of the same LS2ST3 Wide Fixed lens differs across the series below. When selecting a lens, use the value corresponding to the series of the actual projector.

Model Series	Throw Ratio
—	0.78:1

IV. Three Checks Before Replacement

• Confirm the projector chip and resolution. Original lenses are designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the image, causing vignetting or edge light loss after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 0.78:1; use the table in Section 2 to calculate the distance for your installation site. A fixed-focus lens offers no adjustment margin, and even a zoom lens should have 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. Original lenses are calibrated to the mount used on the relevant projector series. After installation, you must hear the lock engage fully. A skewed image or soft edges is usually caused by incomplete locking, rather than a problem with the lens itself.

If you are unsure, send us one photo each of the projector nameplate and the nameplate on the existing lens. Verification against the actual hardware is the safest approach.