Vivitek 3797893200-SVK Long Zoom 1 Long-Throw Projector Lens for DU9800Z-BK

Vivitek Genuine Lens 3797893200-SVK Long Zoom 1 is an original optical accessory for Vivitek professional projectors. It is a Long Throw lens with a 2.00-4.00:1 throw ratio, designed for inch panels in the DU/DW/DX Engineering Series. The manufacturer's compatibility list covers 1 model. Before installation, simply verify the projector model and panel size—no adapter rings are needed. The value of a genuine lens lies not in the additional rows of specifications, but in its factory calibration to the optical path and mount of the projector series. The image circle, edge illumination, and focus travel are all factory-designed values, so there is no need to rely on keystone correction to compensate for image quality.

I. Lens Specifications

Brand	Vivitek (Vivitek)
Lens Model	3797893200-SVK Long Zoom 1
Throw Ratio	2.00-4.00:1
Product Type	Long Throw
Compatible Panels	Inch panels for the DU/DW/DX Engineering Series
Models Covered	1 model
Warranty	12 months; damage not attributable to the user is eligible for after-sales service, subject to the date on the shipping documents

These specifications are subject to the manufacturer's original specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please contact us with the exact projector model for verification. Ordering solely based on a similar model carries the risk of an incompatible fit.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This genuine lens is a zoom lens (2.00-4.00:1), so the same image size corresponds to a range of installation distances. It can focus at any position within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 4.30 – 8.60 m
120 inches	2.58 m	approx. 5.16 – 10.32 m
150 inches	3.22 m	approx. 6.45 – 12.90 m
200 inches	4.30 m	approx. 8.60 – 17.20 m

These figures represent the clear distance from the front of the lens to the screen and do not include space behind the projector for cooling and cable connections. They are calculated for a 16:10 image; actual values should be confirmed through on-site measurement and the manufacturer's manual.

Image quality differs at both ends of the zoom range: the image is brighter with slightly softer edges near the close end, while the edges are sharper with slightly lower brightness near the far end. Where the venue allows, the middle of the range is recommended. After installation, use the focus ring to find the sharpest position, then fine-tune the lens shift.

III. Compatible Models (1 Model)

The table below is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the model database; unavailable values are shown as — and are not estimated.

Model	Brightness	Resolution
DU9800Z-BK	18000 lumens	1920x1200

To check whether a model outside the list is compatible, send us photos of the projector nameplate and 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 by Model Series

The nominal throw ratio varies by series when the same 3797893200-SVK Long Zoom 1 is installed. Select the value based on the actual projector series.

Model Series	Throw Ratio
—	2.00-4.00:1

IV. Three Checks Before Replacement

• Make sure the panel size matches.3797893200-SVK Long Zoom 1 is designed for inch panels in the DU/DW/DX Engineering Series. Even if the lens mount fits, a projector with a different panel size or resolution may experience problems with the image circle and edge illumination.
• Calculate the installation distance first.The lens has a rated throw ratio of 2.00-4.00:1. Use the table in Section II to calculate the distance for your venue's screen size. A fixed-focus lens offers no adjustment range, and even a zoom lens requires 10–20 cm of margin at both ends.
• Check the mount and locking mechanism.The genuine lens is calibrated to the mount used on this projector series, and you must hear it click into the locked position after installation. A skewed image or soft edges usually indicate that the lens is not fully locked, rather than a problem with the lens itself.

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