Vivitek VL901G Standard Zoom Lens Analysis: Fits D5180HD D5280U

Vivitek OEM Lens VL901G Standard Zoom is an OEM optical accessory for Vivitek professional projectors. It features a standard throw (Standard Throw), a throw ratio of 1.54-1.93:1, and corresponds to D/H Engineering/Cinema Series panel sizes (in inches). The OEM compatibility list covers 2 models; before installation, simply verify the projector model and panel size rather than making do with an adapter ring. The value of an OEM lens lies not in the extra rows of figures in its specification sheet, but in the fact that its optical path and mount are factory-calibrated for that projector series. Once installed, the image circle, edge illumination, and focus travel are all at their design values, so there is no need to rely on keystone correction to compensate for image quality.

1. Lens Specifications

Brand	Vivitek (Vivitek)
Lens Model	VL901G Standard Zoom
Throw Ratio	1.54-1.93:1
Product Type	Standard Throw (Standard Throw)
Applicable Panel	D/H Engineering/Cinema Series panel sizes (in inches)
Compatible Models	2 units
Warranty	12 months; after-sales service is available for damage not caused by improper handling, based on the date on the dispatch invoice

The above specifications are subject to the manufacturer's original specifications. For mechanical dimensions, flange distance, and mount type not listed in the specification table, please verify them with us against the projector model. Placing an order solely because the model numbers are similar carries the risk that the lens will not fit.

2. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of installation distance to image width. This OEM zoom lens (1.54-1.93:1) produces a range of installation distances for each image size, and it can be brought into focus anywhere within that range.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 3.31 – 4.15 m
120 inches	2.58 m	approx. 3.97 – 4.98 m
150 inches	3.22 m	approx. 4.97 – 6.22 m
200 inches	4.30 m	approx. 6.62 – 8.30 m

These figures represent the clear distance from the front surface of the lens to the screen and do not allow for cooling clearance or cable-connection space behind the projector. They are calculated for a 16:10 image; actual values should be confirmed through on-site measurements 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 is slightly lower. Where the venue allows, placing the projector near the middle of the range is recommended. After installation, first find the sharpest setting on the focus ring, then fine-tune the lens shift.

3. Compatible Models (2 Units)

The following table is taken from the OEM compatibility list. Brightness and resolution are populated from the model database; where data is unavailable, an em dash (—) is shown, and no values are inferred.

Model	Brightness	Resolution
D5180HD	4200 lumens	1920x1080
D5280U	4500 lumens	1920x1200

To determine whether a model outside the list is supported, send us photographs of the projector nameplate and the existing lens for verification—platforms of the same generation often share a mount, but ordering based on a similar model is not worth the risk.

Throw Ratio by Model Series

When the same VL901G Standard Zoom is installed in the following series, the rated throw ratio varies. Select the value corresponding to the series of the actual projector.

Model Series	Throw Ratio
—	1.54-1.93:1

4. Three Checks Before Replacement

• Confirm the panel size.VL901G Standard Zoom is designed for D/H Engineering/Cinema Series panels (in inches). For a projector with a different panel size or resolution, the image circle and edge illumination may be compromised even if the mount physically fits.
• Calculate the installation distance first.Use the rated throw ratio of 1.54-1.93:1 and the table in Section 2 to calculate the distance for your installation space. A fixed-focal-length lens offers no adjustment margin, and even a zoom lens should have 10–20 cm reserved at both ends of the range.
• Verify the mount and locking mechanism.The OEM lens is calibrated for the mount used on this projector series. After installation, confirm that it clicks fully into the locked position. A skewed image and soft edges are usually caused by incomplete locking, rather than a problem with the lens itself.

If you are unsure, send us one photo each of the projector nameplate and the existing lens nameplate; checking against the actual hardware is the most reliable approach.