JVC GLMS-4009SZG Zoom Standard-Throw Lens for DLA-VS4600

JVC Original Lens GLMS-4009SZG Zoom is an original optical accessory for JVC professional projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 0.94-1.30:1. The manufacturer’s official compatibility list covers 1 model. Before installation, simply verify the projector model and panel size—no need to make do with an adapter ring. The value of an original lens lies not in the extra figures on the specification sheet, but in its factory calibration to the optical path and mount of the projector series. Once installed, the image circle, edge illumination, and focus travel are all at their designed values, so there is no need to compensate for image quality with keystone correction.

I. Lens Specifications

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

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This original zoom lens (0.94-1.30:1) provides a range of distances for each image size, and it can focus anywhere within that range during installation.

The distances above are clear distances from the front surface of the lens to the screen and do not include space for rear ventilation and cable connections. They are calculated for a 16:10 aspect ratio; actual values are subject to on-site measurements and the manufacturer’s manual.

Image quality differs at the two ends of the zoom range: images are brighter but the edges are slightly softer near the short end, while edges are sharper but brightness is slightly lower near the long end. Where the venue allows, use the middle of the range. After installation, find the sharpest position using the focus ring, then fine-tune the lens shift.

III. Compatible Models (1 Model)

The following table is taken from the manufacturer’s official compatibility list. Brightness and resolution are populated from the model database; unavailable data is shown as “—” and has not been estimated.

To determine whether a model outside the list is compatible, send us photos of the projector nameplate and the existing lens for verification. Platforms of the same generation often share the same mount, but the risks of ordering based solely on a similar model are not worth taking.

Throw Ratios by Model Series

The nominal throw ratio varies by series when the same GLMS-4009SZG Zoom is installed on the following series. Select the value based on the series of the actual projector.

IV. Three Checks Before Replacement

• Check 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 full panel, resulting in vignetting or edge light loss.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.94-1.30:1. Use the table in Section II to match the dimensions of your venue. A fixed-focus lens offers no adjustment margin, and a zoom lens should also allow an additional 10–20 cm at both ends of the range.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount of the projector series and must be heard to lock into place after installation. A skewed image or 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 option.