Vivitek D89-UST01 Ultra Short Zoom Lens for DK8155Z DU8053Z DU8055Z DU8057Z

Vivitek Genuine Lens D89-UST01 Ultra Short Zoom is an OEM optical accessory for Vivitek engineering projectors. It is an ultra short throw (Ultra Short Throw) lens with a throw ratio of 0.31-0.33:1, designed for the inch panels in the DU/DW/DX engineering series. The manufacturer's compatibility list covers 4 models, so simply verify the projector model and panel size before installation—no adapter ring workaround is needed. The value of an OEM lens lies not in the extra figures it adds to a specification sheet, but in the fact that it is calibrated at the factory to the optical path and mount of that projector series: once installed, the image circle, edge illumination, and focusing travel are all at their design values, with no need to compensate for image quality with keystone correction.

1. Lens Specifications

These specifications are subject to the manufacturer's specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please verify them with us using the projector model; ordering based solely on a similar model carries the risk that the lens will not fit.

2. Converting Throw Ratio into Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This OEM lens is a zoom lens (0.31-0.33:1), so a given image size corresponds to a range of distances; the lens can focus at any distance within that range during installation.

These figures represent the clear distance from the front of the lens to the projection screen, excluding space required for rear-projector cooling and cable connections. They are calculated for a 16:10 image; actual installation should be verified on site and in accordance with the manufacturer's manual.

Image quality differs at the two ends of the zoom range: near the close end, the image is brighter and the edges are slightly softer; near the far end, the edges are sharper and brightness decreases slightly. When site conditions allow, place the lens near the middle of the range, then find the sharpest setting on the focus ring after installation and fine-tune the lens shift.

3. Compatible Models (4 Models)

The table below is taken from the manufacturer's compatibility list. Brightness and resolution have been populated from the model database; where the data is unavailable, an em dash (—) is shown, with no assumptions made.

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 a mount, but ordering solely based on a similar model is not worth the risk.

Throw Ratios for Different Model Series

The rated throw ratio varies by projector series when the same D89-UST01 Ultra Short Zoom lens is used. Select the value based on the series of the actual projector.

4. Three Checks Before Replacement

• The panel size must match. D89-UST01 Ultra Short Zoom is designed for DU/DW/DX engineering-series inch panels. Even if the mount accepts it, projectors with different panel sizes or resolutions may experience problems with image circle coverage and edge illumination.
• Calculate the installation distance first. This lens has a rated throw ratio of 0.31-0.33:1. Use the table in Section 2 to calculate the distance for your site. A fixed-focus lens offers no adjustment margin, and a zoom lens should also allow an extra 10–20 cm at both ends.
• Verify the mount and locking mechanism. The OEM lens is calibrated to the mount of that projector series, and you must hear it lock into place after installation. A skewed image or soft edges are usually caused by incomplete locking, not by 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.