Vivitek D98-2040 Long Zoom Lens Analysis: DU9900Z-BK Compatibility

Vivitek OEM Lens D98-2040 Long Zoom is an original optical accessory for Vivitek engineering projectors. It is a long-throw (Long Throw) lens with a throw ratio of 2.00-4.00:1, designed for DU/DW/DX engineering-series inch panels. The official compatibility list covers 1 model; before installation, simply verify the projector model and panel size—no need to improvise with an adapter ring. The value of an OEM lens lies not in a few extra rows in the specification table, but in the fact that it is calibrated at the factory to the optical path and lens mount of projectors in that series: once installed, image-circle coverage, edge illumination, and focusing travel all meet the design values, with no need to use keystone correction to compensate for image quality.

I. Lens Specifications

The above specifications are subject to the official specifications. For mechanical dimensions, flange distance, and mount type not shown in the specification table, please contact us with the projector model for verification. Placing an order solely on the basis of a similar model carries the risk that the lens will not fit.

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This OEM zoom lens has a throw ratio of 2.00-4.00:1, so a given image size corresponds to a range of installation distances. Focus can be achieved at any position within that range.

The above distances are clear measurements from the front of the lens to the screen and do not include rear clearance for heat dissipation and cable connections. They are calculated for a 16:10 image; actual values should be verified through on-site measurements and the manufacturer's manual.

Image quality differs at 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. Where the venue permits, use the middle of the range. After installation, first find the sharpest position on the focus ring, then fine-tune the shift.

III. Compatible Models (1 model)

The following table is taken from the official compatibility list. Brightness and resolution are populated from the model database; values that cannot be obtained are marked “—” and are not estimated.

To verify whether a model not included in the list is compatible, send us photographs of the projector nameplate and the existing lens for confirmation. Platforms of the same generation often share the same mount, but the risks of ordering based on a similar model outweigh the convenience.

Throw Ratios by Model Series

The nominal throw ratio varies by series when the same D98-2040 Long Zoom is installed on the series listed below. Use the value corresponding to the actual projector series when selecting a lens.

IV. Three Checks Before Replacement

• Make sure the panel size matches. D98-2040 Long Zoom is designed for DU/DW/DX engineering-series inch panels. Machines with different panel sizes or resolutions may experience image-circle and edge-illumination problems even if the lens mount fits.
• Calculate the installation distance first. This lens has a rated throw ratio of 2.00-4.00:1. Use the table in Section 2 to calculate the distance for your installation site. A fixed-focus lens provides no adjustment margin, and even a zoom lens should allow an additional 10–20 cm at both ends.
• Verify the mount and locking mechanism. The OEM lens is calibrated to the mount used on projectors in this series. After installation, you must hear the lens lock into place. A skewed image or soft edges are usually caused by incomplete locking, rather than a problem with the lens itself.

If you are unsure, take one photograph each of the projector nameplate and the existing lens nameplate and send them to us. Verification against the physical items is the most reliable approach.