Vivitek 3797886100-SVK Standard Zoom Lens for DU9800Z-BK

Vivitek Original Lens 3797886100-SVK Standard Zoom is an OEM optical accessory for Vivitek professional projectors. It is a standard-throw (Standard Throw) lens with a 1.50-2.00:1 throw ratio, designed for the inch panels in the DU/DW/DX engineering series. The OEM compatibility list covers 1 model. Before installation, simply verify the projector model and panel size; there is no need to make do with adapter rings. The value of an OEM lens lies not in the extra figures it adds to a specification sheet, but in its factory calibration to the optical path and mount of that projector series. Once fitted, the image circle, edge illumination, and focusing travel all remain at their design values, so there is no need to use keystone correction to compensate for image quality.

1. Lens Specifications

The above specifications are subject to the manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not listed in the specifications table, please verify them with us against the projector model. Placing an order based solely on a similar model carries the risk that the lens will not fit.

2. Converting Throw Ratio to Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (1.50-2.00:1), so a given image size corresponds to a range of installation distances, and it can focus at any point within that range.

These figures represent the clear distance from the front surface of the lens to the screen and do not account for heat-dissipation and cable-connection space behind the projector. They are calculated for a 16:10 image; actual distances should be confirmed by on-site measurement and the manufacturer's manual.

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

3. Compatible Models (1 unit)

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

For models not included in the list, please send us photos of the projector nameplate and the existing lens for verification. Platforms from the same generation often share the same mount, but the risks of ordering based on a similar model outweigh the convenience.

Throw Ratio by Model Series

The nominal throw ratio differs by series when the same 3797886100-SVK Standard Zoom is installed on the series listed below. Use the series of the actual projector for selection.

4. Three Checks Before Replacement

• Make sure the panel size matches. 3797886100-SVK Standard Zoom is designed for DU/DW/DX engineering-series inch panels. Even if the mount fits, a projector with a different panel size or resolution may present problems with the image circle and edge illumination.
• Calculate the installation distance first. This lens has a rated throw ratio of 1.50-2.00:1. Use the table in Section 2 to calculate the distance for your venue. A fixed-focus lens offers no adjustment margin, and even a zoom lens requires 10–20 cm of allowance at both ends of the range.
• Verify the mount and locking mechanism. The OEM lens is calibrated to the mount of that projector series. You must hear it lock into place 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, take one photo of the projector nameplate and one of the existing lens nameplate and send them to us. Verification against the physical items is the safest approach.