Vivitek D86-1929 Semi Long Zoom 1 Lens Review: 10 Compatible Models

Vivitek Genuine Lens D86-1929 Semi Long Zoom 1 is an OEM optical accessory for Vivitek engineering projectors. It is a Long Throw lens with a 1.93-2.90:1 throw ratio and is designed for DU/DW/DX Engineering Series panels (in inches). The manufacturer's compatibility list covers 10 models. Before installation, simply verify the chassis model and panel size; there is no need to make do with an adapter ring. The value of an OEM lens lies not in the extra figures in a specification sheet, but in the fact that it is calibrated at the factory to the optical path and mount of that chassis series. Once installed, the image circle, edge illumination, and focus travel all meet their design values, with no need to use keystone correction to compensate for image quality.

I. Lens Specifications

These specifications are subject to the manufacturer's final specifications. For mechanical dimensions, flange distance, and mount type not shown in the specifications table, please contact us with your chassis model for verification. Ordering solely based on 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 installation distance to image width. This OEM lens is a zoom lens (1.93-2.90:1), so a given image size corresponds to a range of installation distances. The lens can be focused anywhere within that range.

These are clear distances from the front face of the lens to the screen and do not include space behind the chassis for cooling and cable connections. The figures are calculated for a 16:10 image; actual distances should be verified through on-site measurement and in accordance with the manufacturer's manual.

Image quality differs at the two ends of the zoom range: toward the near end, the image is brighter and the edges are slightly softer; toward the far end, the edges are sharper but the image is slightly dimmer. Where the venue allows, using the middle of the range is recommended. After installation, first find the sharpest position on the focus ring, and then fine-tune the lens shift.

III. Compatible Models (10 Models)

The following table is taken from the manufacturer's compatibility list. Brightness and resolution are populated from the model database; unavailable data is marked “—” rather than estimated.

To confirm whether a model not on the list is compatible, send us a photo of the chassis nameplate and the existing lens. Platforms of the same generation often share mounts, but the risk of ordering based on a similar model is not worth taking.

Throw Ratio by Model Series

The nominal throw ratio varies by series when the same D86-1929 Semi Long Zoom 1 lens is used. Select the value according to the series of the actual chassis.

IV. Three Checks Before Replacement

• The panel size must match. D86-1929 Semi Long Zoom 1 is designed for DU/DW/DX Engineering Series panels (in inches). Even if the lens mount fits, projectors with a different panel size or resolution may experience problems with image circle and edge illumination.
• Calculate the installation distance first. This lens has a nominal throw ratio of 1.93-2.90:1. Use the table in Section II to match the lens to your venue dimensions. A fixed-focus lens offers no adjustment allowance, while a zoom lens should leave a 10–20 cm margin at both ends of the range.
• Verify the mount and locking mechanism. The OEM lens is calibrated to the mount used on this chassis series. After installation, you must hear it lock securely into position. 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 photo of the chassis nameplate and one of the existing lens nameplate, then send them to us. Verification against the actual hardware is the most reliable approach.