If you are an engineer or an optics integrator, you know that finding the "Goldilocks" lens—one that isn't too long, isn't too wide, and actually fits your sensor—is a headache. Today, we are putting the spotlight on a specific focal length contender that is turning heads in the industrial sector: the JSD3122.

Let’s get one thing straight immediately: The JSD3122 is not for your vacation GoPro or a budget webcam. This is professional-grade glass designed for the high-stakes world of machine vision, automated inspection, and precision security.

We’ve broken down the specs to see why this 3.94mm lens is the top recommendation for your next build.

1. The "Anti-Fisheye" Wide Angle

A 3.94mm focal length usually lands you in wide-angle territory. With a Field of View (FOV) of 92°, the JSD3122 captures a massive scene.

The Problem: Usually, a 92° view comes with the dreaded "barrel distortion," making your image look like a fun-house mirror.

The JSD3122 Solution: This lens boasts optical distortion of < -1.54%. That is exceptionally low. Lines remain straight, edges stay true, and your image recognition software doesn't have to work overtime to de-warp the feed. It offers a "Linear" view that is critical for measurement and detection tasks.

2. Feeding the Beast: 1/2" Sensor Support

This is the headline feature. Most M12 lenses (S-Mount) are designed for smaller 1/3" or 1/4" sensors. The JSD3122 punches up. It covers a large 1/2" Image Circle.

Why it matters: You can use larger, high-end industrial sensors (for better low-light performance and dynamic range) without changing your lens mount size. It keeps your overall module size down but your image quality way up.

3. Razor-Sharp 12MP Resolution

In the industrial world, a fuzzy image isn't "artistic"—it's a failure. The JSD3122 is rated for 12MP Resolution. Whether you are inspecting micro-cracks on a production line or capturing high-res security footage, this lens resolves every pixel your sensor can throw at it.

4. Compact Design, Bright Output

Despite its high specs, the JSD3122 remains physically efficient.

Fast Aperture: With an F/NO of 2.2, it’s bright enough for variable lighting conditions in factories or warehouses.

Tight Fit: The TTL (Total Track Length) is just 20.49mm. It’s short, stout, and fits easily into compact housings where space is at a premium.

Specification Cheat Sheet:

Model: JSD3122

Focal Length (EFL): 3.94mm (The sweet spot!)

Resolution: 12MP (Ultra-HD ready)

Image Circle: 1/2" (Large format support)

Distortion: < -1.54% (Low distortion)

Aperture: F/2.2

FOV: 92°

Mount: M12 Thread

Dimensions: TTL 20.49mm

If you are building a system that requires a wide 90-degree view but can't afford the distortion of a standard wide-angle lens, the JSD3122 is your answer. It bridges the gap between compact M12 convenience and professional 1/2" sensor performance.

Don't settle for warped images or vignetting. Choose the JSD3122 for a clearer, wider, and straighter perspective.