In ultra-low-light imaging, the Sony IMX385 is hailed as the "King of Night Vision" due to its massive 3.75μm pixels. However, to squeeze every drop of sensitivity from this sensor, engineers typically pair it with F1.0 ultra-large aperture lenses. Under such high-throughput conditions, controlling stray light is the technical "red line" that determines image purity.

1. Physical Challenges: Why Do Large Apertures Generate "Light Noise"?

When an aperture reaches F1.0, the light energy entering the lens is approximately 300% higher than that of a standard F2.0 lens. While this energy provides necessary brightness, it also triggers severe optical side effects:

Internal Reflection (Ghosting): Intense light bounces repeatedly between multiple lens elements. At the High Gain states typical for the IMX385, even weak reflections are magnified into prominent ghost images.

Loss of Contrast: Non-imaging light beams enter the lens barrel, causing a "fogging" effect. JSD Optical utilizes a secondary extinction thread design to effectively absorb over 95% of off-axis light.

Edge Blooming: For the large 1/1.8" sensor format, light incident angles are extreme. If the BFL (Back Focal Length) is not precisely controlled, peripheral image quality deteriorates rapidly.

"In ultra-low-light systems, contrast is more important than brightness. Without stray light control, image quality will be drowned in a gray fog." — Technical Review, "Modern Optical Engineering."

2. Technical Specifications: IMX385 Lens Adaptation Table

Based on official Sony IMX385 DataSheet metrics, the following selection parameters are recommended for precision results:

3. JSD Optical: Hardcore R&D for "Precision Interception"

To meet the extreme requirements of the IMX385, JSD Optical seals off stray light paths through fundamental manufacturing processes:

Aspherical Glass Technology: We introduce high-refractive-index aspherical elements to compensate for spherical aberrations caused by large apertures. This ensures that even at a wide-open F1.0, peripheral resolution remains matched to the 3.75μm pixels.

BBAR Ultra-Broadband Coating: JSD utilizes multi-layer vacuum physical vapor deposition (PVD) to suppress reflectivity below 0.2%. This solves ghosting issues caused by direct intense light at the source.

Micron-Level Focusing Precision: Large-aperture lenses have an extremely shallow depth of field. We use AA (Active Alignment) assembly processes to ensure the lens is perfectly parallel to the IMX385 focal plane, with errors controlled at the micron level.

4. Delivering Pure Color to the Darkness

Choosing the IMX385 is about seeing into the dark; JSD Optical's large-aperture, low-stray-light lenses serve as the "optical cornerstone" to achieve that goal. Leveraging our advantages as a source manufacturer, we provide precise optical adaptation from sampling to mass production.

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