BenQ 5J.JDH37.002 Wide Fixed Short-Throw Lens for W8000

BenQ Genuine Lens 5J.JDH37.002 Wide Fixed is a genuine optical accessory for BenQ professional projectors. It is a short-throw lens (Short Throw) with a 0.78:1 throw ratio. The manufacturer's compatibility list covers one model; before installation, simply verify the projector model and panel size—there is no need to use an adapter ring to make it fit. The value of a genuine lens lies not merely in the additional specifications, but in its factory calibration to the optical path and mount of the relevant projector series. Once installed, image-circle coverage, edge illumination, and focusing travel all meet their design specifications, so keystone correction is unnecessary to compensate for image quality.

1. Lens Specifications

Brand	BenQ (BenQ)
Lens Model	5J.JDH37.002 Wide Fixed
Throw Ratio	0.78:1
Product Type	Short-throw lens (Short Throw)
Compatible Models	1 projector
Warranty	12 months; after-sales service applies to damage not caused by the user, based on the date on the shipping receipt

The above specifications are subject to the manufacturer's published specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please contact us with the projector model. Ordering solely based on a similar model carries the risk that the lens will not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This genuine lens has a fixed focus (0.78:1), so the installation distance varies linearly with image size and offers no adjustment margin. Accurate measurements are therefore 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 distances above are clear distances from the front surface of the lens to the screen and do not allow for ventilation or cable connections at the rear of the projector. The calculations are based on a 16:10 aspect ratio; actual values should be confirmed through on-site measurements and the manufacturer's manual.

3. Compatible Models (1 Projector)

The table below is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the model database; where the data is unavailable, “—” is shown rather than making assumptions.

Model	Brightness	Resolution
W8000	2000 lumens	1920x1080

To check compatibility with a model not on the list, please send us a photo of the projector nameplate and the existing lens. Platforms from the same generation often share the same mount, but the risk of ordering based on a similar model is not worth taking.

Throw Ratios for Different Projector Series

When the same 5J.JDH37.002 Wide Fixed is fitted to the projector series below, the nominal throw ratio varies. For selection purposes, use the value for the actual projector series.

Projector Series	Throw Ratio
—	0.78:1

4. Three Checks Before Replacement

• Confirm the projector chip and resolution. Genuine lenses are designed for a specific panel size. If the panel specifications differ, the image circle cannot cover the panel, resulting in vignetting or light loss at the edges.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.78:1. Use the table in Section 2 to apply the ratio to the dimensions of your installation site. A fixed-focus lens offers no adjustment margin; even for a zoom lens, allow 10–20 cm at both ends of the range.
• Verify the mount and locking mechanism. The genuine lens is calibrated to the mount of the relevant projector series. After installation, you must hear the locking mechanism engage fully. Image skew and soft edges are usually caused by incomplete locking, rather than a problem with the lens itself.

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