BenQ LS2ST1 Wide Zoom Standard Throw Lens for LU9235 PX9230

BenQ Genuine Lens LS2ST1 Wide Zoom is a genuine optical accessory for BenQ business projectors. It is a standard-throw lens (Standard Throw), with a throw ratio of 1.10:1 - 1.30:1. The manufacturer's compatibility list covers 2 models; before installation, simply verify the projector model and panel size, with no need to make do with an adapter ring. The value of a genuine lens lies not in the extra rows of figures in the specification sheet, but in its factory calibration to the optical path and mount of that model series: once installed, the image circle, edge illumination, and focus travel all match their designed values, so there is no need to use keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the manufacturer's specifications. Mechanical dimensions, flange distance, and mount type, which are not shown in the specification table, should be verified with us based on the projector model. Ordering solely because a model is similar carries the risk that the lens will not fit.

2. Calculating Installation Distance from the Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This genuine lens is a zoom lens (1.10:1 - 1.30:1), so the same image size corresponds to a range of distances. It can be focused at any distance within that range during installation.

These figures represent the clear distance from the front surface of the lens to the screen and do not allow for cooling and cable-routing space at the rear of the projector. They are calculated for a 16:10 image; for actual installation, refer to on-site measurements and the manufacturer's manual.

Image quality differs at the two ends of the zoom range: at the shorter end, the image is brighter and the edges are slightly softer; at the longer end, the edges are sharper and brightness is slightly lower. Where the venue permits, the middle of the range is recommended. After installation, find the sharpest position on the focus ring first, then fine-tune the lens shift.

3. Compatible Models (2 Models)

The table below is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the model database; unavailable entries are shown as “—”, and no values are estimated.

To check whether a model outside the list can be used, send us photos of the projector nameplate and existing lens. Platforms of the same generation often share a mount, but the risk of ordering based only on a similar model number is not worth taking.

Throw Ratio by Model Series

The rated throw ratio of the same LS2ST1 Wide Zoom lens varies across the following series. Select the value according to the series of the actual projector.

4. Three Checks Before Replacement

• Confirm the projector chip and resolution. Genuine lenses are designed for a specific panel size; when the panel specifications differ, the image circle cannot cover the panel, resulting in vignetting or light loss at the edges after installation.
• Calculate the installation distance first. This lens has a rated throw ratio of 1.10:1 - 1.30:1. Use the table in Section 2 to calculate the distance for your venue; fixed-focus lenses offer no margin, and zoom lenses should also leave 10–20 cm at both ends.
• Check the mount and locking mechanism. Genuine lenses are calibrated to the mount of that model series, and you must hear the lock click fully into place after installation; a skewed image and soft edges usually indicate that the lock is not fully engaged, rather than a problem with the lens itself.

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