WA109 Projector Lens 1.07:1 for 2 Optoma Engineering Models: ZK1050, ZK750

WA109 is a medium-to-long-throw lens for 0.65/0.66/0.67 panels (Optoma), with a 1.07:1 throw ratio. It is compatible with 2 models across 1 model series. This article presents the lens specifications, installation distances, compatibility list, and replacement considerations in one place.

I. Lens Specifications

II. Calculating Installation Distance from Throw Ratio

The throw ratio is the ratio of the installation distance to the image width. This lens has a fixed focal length (1.07:1), so the installation distance changes linearly with image size, with no zoom adjustment margin. Accurate measurements must be taken before installation.

The distances above are the clear distances from the front of the lens to the screen and do not account for clearance for rear chassis cooling and cabling. They are calculated based on a 16:10 aspect ratio; actual figures are subject to on-site measurement and the manual.

III. Compatible Models (2 Models, Optoma)

The table below is sorted by model production date, from newest to oldest, and includes the resolution, brightness, and factory-installed lens zoom ratio of each model, making it easy to identify the right option for project requirements.

Common Features of These Models

The factory-installed standard lenses for these 2 models generally have throw ratios listed as Depends on the lens. The 1.07:1 model featured in this article effectively adjusts the focal range, enabling different image sizes from the same projection distance—this is precisely the reason for replacing the lens. It also retains full lens-shift capability, allowing the image to remain properly aligned after adjusting the focal range.

IV. Three Things to Confirm Before Replacement

• The panel size and resolution must match. This model is designed for 0.67-inch panels. Projectors with different panel sizes or resolutions may produce somewhat different projection performance, so it is safest to check the chassis nameplate before installation.
• Check the interfaces and locking mechanism. Interfaces are generally compatible within the same platform generation, but the positions of the locking tabs vary between generations. If the image appears skewed or the edges are not sharp after installation, the locking mechanism is usually not fully engaged rather than the lens itself being faulty.
• A fixed-focus lens has no zoom adjustment margin. The image size can only be changed by moving the projector, so the venue dimensions must be measured accurately in advance, with an additional 10–20 cm allowed at each endpoint.

For compatibility with models not listed, it is safer to send us a photo of the chassis nameplate and the original lens for verification—same-generation platforms often share the same interfaces, but ordering based on a similar model designation carries unnecessary risk.