Vivitek GB805G Short Fixed Short-Throw Projector Lens: D5500 Compatibility

Vivitek Original Lens GB805G Short Fixed is a genuine optical accessory for Vivitek engineering projectors. It is a short-throw lens with a throw ratio of 0.77:1, designed for D/H engineering and cinema series panels. The original compatibility list covers 1 projector model; before installation, simply verify the projector model and panel size — no adapter rings needed. The value of an original lens isn't a few extra rows of numbers in a spec sheet, but the fact that it is calibrated at the factory to the optical path and mount of that series: once installed, the image circle, edge illumination, and focus travel all match design values, so you don't need keystone correction to compensate for image quality.

1. Lens Specifications

Brand	Vivitek (Vivitek)
Lens Model	GB805G Short Fixed
Throw Ratio	0.77:1
Product Type	Short Throw
Compatible Panel	D/H engineering and cinema series inches
Covered Models	1 unit
Warranty	12 months; non-human damage is covered by after-sales service, based on the date on the shipping document

The above specifications are subject to the original manufacturer's specifications. For mechanical dimensions, flange focal distance, and mount type not shown in the spec table, please verify with us against your projector model — ordering based on similar model numbers carries the risk of incompatibility.

2. Converting Throw Ratio to Installation Distance

Throw ratio is the ratio of installation distance to image width. This original lens is fixed-focal (0.77:1), so the installation distance changes linearly with image size and has no adjustment margin — it must be measured accurately before installation.

Image Size	Image Width	Required Installation Distance
100 inches	2.15 m	approx. 1.66 m
120 inches	2.58 m	approx. 1.99 m
150 inches	3.22 m	approx. 2.48 m
200 inches	4.30 m	approx. 3.31 m

The above values are the clear distance from the lens front to the screen, excluding rear ventilation and cabling space behind the projector. Calculated for a 16:10 aspect ratio; actual values are subject to on-site measurement and the original manufacturer's manual.

3. Compatible Models (1 unit)

The table below is taken from the original compatibility list; brightness and resolution are filled in from the model database, with "—" where unavailable, without speculation.

Model	Brightness	Resolution
D5500	5500 lumens	1024x768

To check whether models outside the list are compatible, please send us photos of the projector nameplate and the existing lens for verification — same-generation platforms often share mounts, but ordering based on similar model numbers is a risk not worth taking.

Throw Ratios Across Different Model Series

The same GB805G Short Fixed lens has different nominal throw ratios when installed on the following series; selection must be based on the series of the actual projector.

Model Series	Throw Ratio
—	0.77:1

4. Three Things to Confirm Before Replacement

• Panel size must match. The GB805G Short Fixed is designed for D/H engineering and cinema series inch panels. Machines with different panel sizes or resolutions may experience image circle and edge illumination issues even if the mount fits.
• Calculate the installation distance first. This lens has a nominal throw ratio of 0.77:1; apply it to your venue dimensions using the table in Section 2. Fixed-focal lenses have no margin, and even zoom lenses should leave 10–20 cm at both ends.
• Check the mount and locking. Original lenses are calibrated to the mount of that series; after installation, you must hear the lock click into place. Image skew and soft edges are usually caused by incomplete locking, not the lens itself.

If unsure, take a photo of the projector nameplate and the existing lens nameplate and send them to us — verification against the actual hardware is the safest approach.