WJ240 Projector Lens 0.62–0.8:1 for SML-L1300U, L1700U, LD1500U

WJ240 is a short-throw lens for 0.65/0.66/0.67 panels (SML), with a throw ratio of 0.62–0.8:1 and lens shift. It is compatible with 3 projector models in 1 model series. This article presents the lens specifications, installation distance, compatible model list, and key replacement considerations in one place.

I. Lens Specifications

Lens shift is the key differentiator of this lens. A shift range of ±53% horizontally and ±23% vertically means the projector can be installed off the screen's central axis, with lens shift bringing the image back into alignment without keystone correction. Keystone correction comes at a cost—each level of correction reduces the usable pixel count and softens text edges. In professional installations, always use lens shift instead of keystone correction whenever possible. This is the baseline for image quality.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This is a zoom lens (0.62–0.8:1), so each image size corresponds to a range of installation distances. The lens can focus at any distance within that range.

The distances above are the clear distances from the front of the lens to the screen and do not include the space required for rear housing cooling and cabling. They are calculated for a 16:10 aspect ratio; actual values are subject to on-site measurements and the manual.

Image quality differs at the two ends of the zoom range: near the short end, the image is brighter but the edges are slightly softer; near the long end, the edges are sharper but the image is slightly dimmer. Whenever the venue allows, aim for the middle of the range. After installation, first find the sharpest position using the focus ring, then fine-tune the lens shift—adjusting both variables at the same time makes it difficult to achieve precise alignment.

III. Compatible Models (3 Models, SML)

The following table is arranged from newest to oldest by model production date and lists each model's resolution, brightness, and factory lens zoom factor, making it easy to identify the right option for your project requirements.

The zoom factor is the zoom magnification of the model's factory standard lens (upper limit ÷ lower limit of the factory throw ratio range), not the zoom range of the lens discussed in this article.

Common Traits of These Models

The factory standard lenses for these 3 models mostly have throw ratios within 1.5-2.4:1. The 0.62–0.8:1 ratio of the model discussed here effectively changes the focal-length range, allowing different image sizes from the same projection distance—this is the direct reason for replacing the lens. Full lens-shift capability is also retained, allowing the image to remain properly aligned after adjusting the focal range.

IV. Three Checks Before Replacement

• Confirm that the panel and resolution match. This model is designed for a 0.67-inch panel. Projection performance may vary on projectors with a different panel size or resolution, so checking the nameplate on the projector before installation is the safest approach.
• Check the connectors and locking mechanism. Same-generation platforms generally offer good connector compatibility, but the positions of locking clips differ between generations. If the image appears skewed or the edges are not sharp after installation, the lock is usually not fully engaged; this is generally not a problem with the lens itself.
• Account for lens-shift headroom in the installation. The shift range provides some installation margin, but edge image quality declines when the lens is pushed to either extreme. Actual use is recommended to remain within 70% of the rated values.

For models not on the list, the safest approach is to send us the projector's nameplate and photos of the original lens for verification. Same-generation platforms often share the same interfaces, but the risks of ordering based solely on similar model names are not worth taking.