Vivitek D88-UST01B Ultra Short Fixed Lens Guide: DU8195Z DU8395Z-BK

Vivitek Original Lens D88-UST01B Ultra Short Fixed is a factory-supplied optical accessory for Vivitek engineering projectors. It features an ultra-short-throw (Ultra Short Throw) design with a 0.38:1 throw ratio and is designed for inch panels in the DU/DW/DX engineering series. The official compatibility list covers 2 models, so verify the projector model and panel size before installation—no adapter ring workaround is needed. The value of an original lens lies not in the extra figures on the specification sheet, but in the fact that its optical path and mount are calibrated to that series from the factory. Once installed, the image circle, edge illumination, and focus travel are all at their design values, eliminating the need to compensate for image quality with keystone correction.

1. Lens Specifications

The above specifications are subject to the manufacturer's official specifications. Mechanical dimensions, flange distance, and mount type are not shown in the specification table; please verify them with us based on the projector model. Placing an order solely because the model numbers are similar risks an incompatible fit.

2. Converting Throw Ratio to Installation Distance

The throw ratio is the ratio of the installation distance to the image width. This original lens is fixed-focus (0.38:1), so the installation distance varies linearly with image size, with no scope for adjustment. Accurate measurements must be taken before installation.

The distances above are clear distances from the front surface of the lens to the screen and do not account for space behind the projector for heat dissipation and cabling. They are calculated for a 16:10 image; actual distances must be confirmed through on-site measurement and against the manufacturer's manual.

3. Compatible Projector Models (2 Models)

The following table is taken from the manufacturer's compatibility list. Brightness and resolution are taken from the model database; where the data is unavailable, — is shown, and no assumptions are made.

For models not included in the list, please send us photos of the projector nameplate and the existing lens so we can verify compatibility. Mounts are often shared among platforms of the same generation, but the risk of ordering based on a similar model is not worth taking.

Throw Ratio by Projector Model Series

The nominal throw ratio varies by series when the same D88-UST01B Ultra Short Fixed is installed on the models listed below. Use the value for the series to which the actual projector belongs.

4. Three Checks Before Replacement

• Panel size must match. D88-UST01B Ultra Short Fixed is designed for inch panels in the DU/DW/DX engineering series. Even if the mount fits, 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 nominal throw ratio of 0.38:1. Use the table in Section 2 to calculate the distance for your installation site. A fixed-focus lens has no adjustment margin, and even a zoom lens requires 10–20 cm of clearance at both ends.
• Verify the mount and locking mechanism. The original lens is calibrated to the mount used on projectors in this series. You must hear it lock into place after installation. A skewed image or soft edges is usually caused by incomplete locking, not by the lens itself.

If you are uncertain, send us one photo of the projector nameplate and one photo of the existing lens nameplate. Verification against the physical items is the safest approach.