FA105 Projector Lens for 3 Diheng Engineering Projectors: DU26K, DU22K, DU21K

FA105 is a medium-to-long-throw lens for engineering projectors (Diheng). It is compatible with 3 projector models across 1 model series. This guide consolidates the lens specifications, installation distances, model compatibility list, and key replacement considerations.

1. Lens Specifications

2. Installation Distance

Throw ratio data for this model is not yet available. For installation distances, refer to the nameplate on the physical unit and the user manual, or contact us to calculate the distance based on the site dimensions.

3. Compatible Projector Models (3 Models, Diheng)

The table below is ordered by model production date, from newest to oldest, and includes the resolution, brightness, and zoom ratio of the original standard lens for each model, helping you quickly identify the right option for your project.

The zoom ratio is the zoom factor of the model's original standard lens (upper limit ÷ lower limit of the original throw ratio range), not the zoom range of the lens featured in this article.

Common Features of These Models

The original standard lenses for these 3 models generally have throw ratios in the 1.5~2.0 range. The lens featured in this article effectively adjusts the focal-length range, allowing different image sizes at the same projection distance—the direct reason for replacing the lens. It also retains full lens-shift capability, so the image can still be aligned after adjusting the focal-length range.

4. Three Things to Confirm Before Replacement

• Check the panel size.Panel specifications for this model are not yet available. Please send us a photo of the nameplate on the projector for confirmation.
• Check the interface and locking mechanism.Interfaces are generally compatible across platforms of the same generation, but the locking latch position varies by generation. If the image appears skewed with soft edges 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 range.Image size can only be changed by moving the projector. The site dimensions must be measured accurately first, with an additional 10–20 cm allowed at each endpoint.

For compatibility with a model not on the list, the safest approach is to send us photos of the projector nameplate and original lens for verification—same-generation platforms often share the same interface, but ordering based only on a similar model number carries unnecessary risk.