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FOV88 MDR20 Relay Lens | RL2288-398 LONTRY®
FOV88 MDR20 Relay Lens | RL2288-398 LONTRY®

FOV88 MDR20 Relay Lens | RL2288-398 LONTRY®

Model No: RL2288-398 • Suitable for product testing within 90° • Small distortion and cost-effective • Suitable for focusing and terminal testing • High universality
$600.00 USD $0.00 USD
Only 998 left
Volume Pricing
$600.00 USD each

Model RL2288-398
FOV Angle 88°
MDR 20mm
Aperture 3mm
Weight 0.325kg
Range of Simulated Distance 300-INFmm
Distortion <0.5%
Outline Dimensions Φ87x35.5mm
Structural Dimension Drawing


*MDR: The installation distance from the camera module to the relay lens camera end .  WDV: Distance from the camera module to the simulated imaging position.
  WDC: Distance from the relay lens object end to the test card.

Optical Properties

Size of Test Card at Maximum Angle
WDV (mm)Distance from the Camera Module to the Simulated Imaging Position WDC (mm)Distance from the Relay Lens Object End to the Test Card Test Card Dimensions(LXW)
16:9 4:3
Length (mm) Width (mm) Length (mm) Width (mm)
400 148.28 314.38 176.84 288.56 216.42
1000 221.28 435.83 245.16 400.04 300.03
5000 288.71 548.03 308.27 503.02 377.27
Infinite Distance 311.29 585.61 329.41 537.52 403.14
Why use relay lens?

Reducing Testing Cost

When the camera module is tested, you need a large test distance and a large target. If the relay lens is used, you can shorten the test distance and reduce the test chart, thereby reducing the test cost in the end.

Improving Test Credibility

Using relay lens in testing can ensure high-quality imaging and footage. What's more, due to the standard test environment, the impact of random errors and uncontrollable factors on the test results can be significantly reduced and the test credibility can be improved.

Increasing Production Efficiency

As relay lens is widely used in the testing of camera modules, the size of production and testing equipment related to camera modules has been well controlled, improving productivity and reducing costs. It also provides effective and feasible solutions for other applications that require testing of camera, such as laboratories.

Application of relay lens

Relay lens is mainly used for camera resolution test. With the development of mobile camera, its application has been constantly extended. It has been used in vehicle, security, video conference equipment, smart home and other fields. In particular, it plays an irreplaceable role in the production and testing of wide-angle and long-focus modules.

Currently, simulation testing (relay lens or collimator array) is almost the only solution in all mass AA (active alignment) production processes, module focusing, and product terminal testing.

Mobile Camera

On-Board Camera

Security Camera

Video Conference Camera

Smart Home Camera

How to select relay lens?

1: FOV

The design FOV of a relay lens shall be slightly larger than the FOV of the camera module.

2: Installation

The parameter design of relay lens takes into account the support for installation structure, so the following three data should be considered when selecting a relay lens:

MDR (the distance from the mechanical rear surface of relay lens to the camera viewpoint) of 6-40mm is suitable;

WDC (the distance from the mechanical front surface (non-optical surface) of relay lens to the chart being tested) shall be usually 150-400mm;

The maximum chart size that the test environment can support.

3: Entrance pupil diameter

The entrance pupil diameter (EFL focal length/ focal number) of a product shall be smaller than the exit pupil diameter of relay lens.

Elements included in a typical relay lens test environment.
Flat light Panel

The luminous area shall be customized according to the parameters of a relay lens; Uniformity shall be greater than 90%; Color temperature shall be 2,700-7,000k; Various infrared bands are optional.

Transmissive Chart

Film is most commonly used; Accuracy shall be ±10 μm; Accuracy shall not be less than 8,000DPI; Suitable edge sharpness of graphics.

Relay Lens

Select a relay lens according to its optical parameters and test environment.


The center of the tested product, relay lens and chart shall be on the same optical axis; Fixed or adjustable height.

Tested Product

Camera Module