Vivitek D99-1215 Short Zoom Standard-Throw Lens Guide for DU9053Z-BK DU9055Z-BK DU9057Z-BK DU9059Z

Vivitek Original Lens D99-1215 Short Zoom is an original optical accessory for Vivitek engineering projectors. It is a standard-throw lens (Standard Throw) with a throw ratio of 1.20-1.56:1, designed for the inch panel sizes used in the DU/DW/DX engineering series. The official compatibility list covers 4 models; before installation, simply verify the projector model and panel size—no adapter rings are needed. The value of an original lens lies not in extra rows of specifications, but in the fact that it is calibrated at the factory to the optical path and lens mount of that series. Once installed, the image circle, edge illumination, and focusing range all meet their design values, with no need to compensate for image quality through keystone correction.

1. Lens Specifications

Brand	Vivitek（Vivitek）
Lens Model	D99-1215 Short Zoom
Throw Ratio	1.20-1.56:1
Product Type	Standard Throw (Standard Throw)
Applicable Panel	Inch panel sizes in the DU/DW/DX engineering series
Models Covered	4 models
Warranty	12 months; eligible for after-sales service if the damage was not caused by the user, based on the date on the shipping invoice

The above specifications are subject to the manufacturer's official specifications. Mechanical dimensions, flange distance, and lens-mount type are not listed in the specification table. Please verify them with us based on the projector model; ordering solely because the model numbers appear similar 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 zoom lens (1.20-1.56:1) covers a range of installation distances for each image size and can focus at any distance within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	Approx. 2.58 – 3.35 m
120 inches	2.58 m	Approx. 3.10 – 4.02 m
150 inches	3.22 m	Approx. 3.87 – 5.03 m
200 inches	4.30 m	Approx. 5.16 – 6.71 m

These distances represent the clear distance from the front surface of the lens to the screen and do not account for rear-housing ventilation or cable-management space. The figures 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: toward the short-throw end, the image is brighter and the edges are slightly softer; toward the long-throw end, the edges are sharper and brightness decreases slightly. Where site conditions allow, use the middle of the range. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

3. Compatible Models (4 Models)

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

Model	Brightness	Resolution
DU9053Z-BK	21000 lumens	1920x1200
DU9055Z-BK	24000 lumens	1920x1200
DU9057Z-BK	27000 lumens	1920x1200
DU9059Z	30000 lumens	WUXGA,1920 x 1200

For compatibility with models not listed, please send us photos of the projector nameplate and the current lens for verification. Platforms of the same generation often share a lens mount, but ordering based on a similar model number alone carries unnecessary risk.

Throw Ratios by Model Series

The stated throw ratio varies by series when the same D99-1215 Short Zoom lens is used. Select the value based on the series of the projector in question.

Model Series	Throw Ratio
—	1.20-1.56:1

4. Three Checks Before Replacement

• Make sure the panel size matches.D99-1215 Short Zoom is designed for the inch panel sizes used in the DU/DW/DX engineering series. On projectors with a different panel size or resolution, the image circle and edge illumination may be compromised even if the lens mount fits.
• Calculate the installation distance first.This lens has a rated throw ratio of 1.20-1.56:1. Use the table in Section 2 to calculate the distance based on your venue dimensions. A fixed-throw lens offers no adjustment range; with a zoom lens, allow an additional 10–20 cm of margin at both ends of the range.
• Verify the lens mount and locking mechanism.The original lens is calibrated for the mounts used on projectors in this series. After installation, make sure you hear the lens click fully into the locked position. A skewed image or soft edges is usually caused by an incompletely locked lens, rather than a fault in the lens itself.

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