Vivitek GB957G Ultra Long Zoom Lens: Compatible with D5500 D5510 D6010 D6510

Vivitek Original Lens GB957G Ultra Long Zoom is an original optical accessory for Vivitek engineering projectors. It is a long-throw lens (Long Throw), with a 4.43-8.30:1 throw ratio for the D/H Engineering·Cinema Series panels (inches). The manufacturer’s compatibility list covers 4 models. Before installation, simply verify 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 figures in the specification table, but in the fact that it is calibrated at the factory to the optical path and lens mount of that projector series: once installed, the image circle, edge illumination, and focus travel all meet their design values, so there is no need to use keystone correction to compensate for image quality.

1. Lens Specifications

Brand	Vivitek（Vivitek）
Lens Model	GB957G Ultra Long Zoom
Throw Ratio	4.43-8.30:1
Product Type	Long-throw lens (Long Throw)
Compatible Panel	D/H Engineering·Cinema Series (inches)
Compatible Models	4 units
Warranty	12 months; after-sales service is available for damage not caused by the user, based on the date of the shipping invoice

The above specifications are subject to the original manufacturer’s 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 directly based on a similar model 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 original lens is a zoom lens (4.43-8.30:1), so a given image size corresponds to a range of installation distances, and the lens can focus at any point within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 9.52 – 17.85 m
120 inches	2.58 m	Approx. 11.43 – 21.41 m
150 inches	3.22 m	Approx. 14.29 – 26.77 m
200 inches	4.30 m	Approx. 19.05 – 35.69 m

The above figures represent the clear distance from the front surface of the lens to the projection screen and do not include clearance for cooling and cable connections at the rear of the projector. They are calculated for a 16:10 image format; actual values are subject to on-site measurements and the original manufacturer’s manual.

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

3. Compatible Models (4 Units)

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

Model	Brightness	Resolution
D5500	5500 lumens	1024x768
D5510	5500 lumens	1024x768
D6010	6000 lumens	1280x800
D6510	6500 lumens	1024x768

To check whether a model outside the list is compatible, please send us a photo of the projector nameplate and the current lens. Platforms from the same generation often share the same lens mount, but the risks of ordering solely on the basis of a similar model are not worth taking.

Throw Ratios by Model Series

The nominal throw ratio differs when the same GB957G Ultra Long Zoom lens is used with the following series. When selecting a lens, use the value for the series to which the actual projector belongs.

Model Series	Throw Ratio
—	4.43-8.30:1

4. Three Things to Confirm Before Replacement

• Make sure the panel size matches. GB957G Ultra Long Zoom is designed for the D/H Engineering·Cinema Series (inches) panels. Even if the lens physically fits the mount, projectors with a different panel size or resolution may experience image-circle and edge-illumination issues.
• Calculate the installation distance first. This lens has a rated throw ratio of 4.43-8.30:1. Use the table in Section 2 to calculate the distance for your venue. Fixed-focus lenses offer no adjustment margin, and zoom lenses should also allow an additional 10–20 cm at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the lens mount of this projector series. After installation, you must hear the lens click into its locked position. A skewed image and soft edges are usually caused by incomplete locking rather than a fault in the lens itself.

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