JVC GL-MS4021SZ Zoom Long-Throw Projector Lens for DLA-VS4010NLG

JVC Original Lens GL-MS4021SZ Zoom is an original optical accessory for JVC professional projectors. It is a long-throw lens (Long Throw) with a throw ratio of 2.15-3.65:1. The manufacturer's model compatibility list covers 1 projector model. Before installation, simply verify it against 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 rows of specifications, but in the fact that it is calibrated at the factory to the optical path and mount of that model series: once installed, the image circle, edge illumination, and focus 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	JVC (JVC)
Lens Model	GL-MS4021SZ Zoom
Throw Ratio	2.15-3.65:1
Product Type	Long Throw
Compatible Projector Models	1 model
Warranty	12 months; after-sales service is available for damage not caused by user error, subject to the date shown on the shipping documents

These specifications are subject to the manufacturer's official specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please verify them with us using the projector model. Placing an order 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 the installation distance to the image width. This original lens is a zoom lens (2.15-3.65:1). For a given image size, it corresponds to a range of distances, and it can focus anywhere within that range when installed.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 4.62 – 7.85 m
120 inches	2.58 m	approx. 5.55 – 9.42 m
150 inches	3.22 m	approx. 6.93 – 11.77 m
200 inches	4.30 m	approx. 9.24 – 15.69 m

These distances represent the clear space from the front surface of the lens to the screen and do not include room for rear chassis ventilation or cable connections. They are calculated for a 16:10 image; actual values should be confirmed by on-site measurement and the manufacturer's manual.

Image quality varies at the two ends of the zoom range: toward the near end, the image is brighter and the edges are slightly softer; toward the far end, the edges are sharper and brightness is slightly lower. Where the venue allows, the middle of the range is recommended. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

III. Compatible Projector Models (1 Model)

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

Model	Brightness	Resolution
JVC DLA-VS4010NLG	—	—

To check whether a projector model not on the list is compatible, please send us photos of the projector nameplate and the existing lens. Platforms from the same generation often share the same mount, but ordering solely because the model looks similar is not worth the risk.

Throw Ratios for Different Model Series

The specified throw ratio varies among the series listed below when the same GL-MS4021SZ Zoom is installed. When selecting a lens, use the series of the actual projector.

Model Series	Throw Ratio
—	2.15-3.65:1

IV. Three Things to Confirm Before Replacement

• Confirm the projector chip and resolution. Original lenses are designed for specific panel sizes. If the panel specifications differ, the image circle will not cover the image, causing vignetting or edge light loss when the lens is installed.
• Calculate the installation distance first. This lens has a specified throw ratio of 2.15-3.65:1. Use the table in Section 2 to calculate the distance for your venue's dimensions; fixed-focus lenses offer no adjustment margin, and zoom lenses should also allow 10–20 cm at both ends.
• Verify the mount and locking mechanism. Original lenses are calibrated to the mount of the corresponding model series, and you must hear the lens click into the locked position after installation. A skewed image or soft edges is usually caused by an incomplete lock, not by 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 against the physical items is the most reliable approach.