WF20A 0.5:1 Projector Lens for 2 Optoma Models incl. EL700K, ZU606T

WF20A is a short-throw lens for the 0.65/0.66/0.67 panel group (Optoma), with a 0.5:1 throw ratio. It is compatible with 2 models in 1 model series. This article presents the lens specifications, installation distances, model compatibility list, and replacement guidance 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 (0.5:1), so the installation distance varies linearly with image size, with no zoom adjustment available. Accurate measurements are essential before installation.

These figures represent the clear distance from the front of the lens to the screen and do not include clearance at the rear of the projector for heat dissipation and cabling. They are calculated for a 16:10 aspect ratio; actual on-site measurements and the product manual prevail.

III. Compatible Models (2 Models, Optoma)

The following table is sorted from newest to oldest by model production date and includes each model’s resolution, brightness, and factory-supplied lens zoom ratio for quick selection according to project requirements.

The zoom ratio is the zoom factor of the model’s factory-supplied standard lens (upper ÷ lower limit of its standard throw-ratio range), not the zoom range of the lens featured in this article.

Common Features of These Models

The factory-supplied standard lenses for these 2 models generally have throw ratios within 1.2:1 ~ 1.92:1. The 0.5:1 model featured here effectively changes the focal length, allowing the same projection distance to produce a different image size—the direct reason for replacing the lens. It also retains full lens-shift capability, so the image can still be aligned after the focal length is changed.

IV. Three Checks Before Replacement

• The panel size and resolution must match. This model is designed for a 0.65-inch panel. Projectors with different panel sizes or resolutions may vary in projection performance, so the safest approach is to verify the specifications against the projector nameplate before installation.
• Check the interface and locking mechanism. Interfaces are generally compatible across platforms of the same generation, but the positions of the locking tabs may differ between generations. A skewed image or unclear edges are usually caused by the lock not being fully engaged rather than by the lens itself.
• A fixed-focus lens has no zoom adjustment. The image size can only be changed by moving the projector. The site dimensions must be measured accurately, allowing an extra 10–20 cm beyond the calculated endpoints.

For models not included in the list, the safest approach is to send us the projector nameplate and a photo of the original lens for verification. Platforms of the same generation often share interfaces, but placing an order solely because the model names appear similar carries unnecessary risk.