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Tech-dat/lens-dat/lens-dat.md
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+# lens-dat
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+
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+
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+
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+- [[glue-lens-dat]] - [[glue-dat]]
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+
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+## camera lens
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+
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+
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+
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+
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+## lens selection
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+
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+![](2025-12-10-15-12-33.png)
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+
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+
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+### Specifications - M12 小型 3.9mm 焦距、F1.0 大光圈镜头
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+
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+- Aperture (F No.): 1.0 ±10%
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+- Focal length (焦距): 3.9 ±5%
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+- Optical back focal length (Optical Back Focal Length): 3.94 ±0.2 mm (in air)
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+- Mechanical back focal length (Mechanical Back Focal Length): 3.85 ±0.2 mm (in air)
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+- Total lens length (TTL): 22.24 ±0.2 mm (in air)
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+- Image circle (像面大小): Ø6.9 mm (MAX)
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+- Lens structure (镜片构成): 1G6P — note: if the first element is a plastic lens, wipe with alcohol only up to 3 times
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+- Mount (接口): M12 × P0.5
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+- Lens-to-base clamp torque (镜头与底座螺纹配合扭力): 60–600 gf·cm
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+- Minimum object distance (近摄距 / M.O.D): 2 m
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+- Resolution (解像标准): 3840 × 2160 (8MP)
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+- Suggested tilt tolerance of sensor packaging: ≤ 5' (minutes)
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+- Weight: /
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+
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+### Field of view (FOV) — sensor size / sensor dimensions (mm)
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+
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+- 1/2.7" — 5.760 × 3.240 × 6.609
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+ - H / V / D (水平 / 垂直 / 对角): 88.1° / 47.5° / 104.1°
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+- 1/2.8" — 5.568 × 3.132 × 6.388
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+ - H / V / D: 84.6° / 45.9° / 100.0°
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+- 1/2.9" — 5.376 × 3.024 × 6.168
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+ - H / V / D: 81.3° / 44.3° / 95.5°
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+
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+
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+### Optical characteristics (by sensor size)
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+
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+- Optical distortion:
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+ - 1/2.7": -34.0%
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+ - 1/2.8": -32.0%
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+ - 1/2.9": -29.0%
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+- TV distortion (TVDistortion):
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+ - 1/2.7": -11.3%
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+ - 1/2.8": -10.4%
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+ - 1/2.9": -9.6%
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+- Relative illumination:
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+ - 1/2.7": 40.6%
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+ - 1/2.8": 43.0%
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+ - 1/2.9": 45.5%
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+- Chief ray angle (CRA):
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+ - 1/2.7": 11.2°
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+ - 1/2.8": 10.8°
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+ - 1/2.9": 10.5°
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+
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+
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+### Operation
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+
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+- Focus (聚焦): Manual
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+- Iris (光圈): Fixed
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+- Environmental & Safety (环保 & 安全): RoHS
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+
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+
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+Notes:
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+
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+- The first optical element may be plastic; if so, clean carefully and limit alcohol wipes to 3 times.
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+
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+![](2025-12-10-14-59-49.png)
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+
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+![](2025-12-10-15-02-40.png)
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+
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+
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+## specs
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+
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+![](2025-12-10-15-11-17.png)
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+
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+
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+
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+## ref
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+
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+- [[lens]] - [[tech]]
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Tech-dat/sensor-camera-dat/Camera-dat.md
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- [[camera-SDK-dat]] - [[camera-sys-dat]]
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+
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+- [[lens-dat]] - [[optical-design-dat]]
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+
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## boards
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17 20
- [[ESP1000-dat]]
mechanics-dat/glue-dat/glue-lens-dat.md
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+
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+# glue-lens-dat
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+
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+
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+## **A. Optical-grade Epoxy (Best + Most Common)**
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+Examples:
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+- **EPO-TEK 301**
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+- **EPO-TEK OG142 / OG159-2**
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+- **Loctite 3771**
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+
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+**Pros**
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+- High transparency (>95%)
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+- No fogging
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+- Waterproof + pressure-resistant
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+- Safe with plastic lenses
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+- Ideal for bonding a flat protective window
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+
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+**Cons**
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+- Long curing time
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+- Must be applied carefully
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+
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+---
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+
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+## **B. Optical UV Adhesives**
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+Examples:
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+- **Norland NOA61 / NOA63 / NOA65 / NOA81**
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+- **Dymax 6-621**
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+
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+**Pros**
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+- Very clear
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+- Fast UV cure
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+- Safe for plastic and glass
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+- Precise control
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+
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+**Cons**
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+- UV light must reach the adhesive
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+- Not ideal for thick layers (>1 mm)
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+
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+
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+
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+## ref
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+
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+- [[glue-dat]] - [[lens-dat]]
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mechanics-dat/mechanical-structure-dat/rod-system-dat/PVC-tube-dat/PVC-tube-dat.md
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+## water tube standard
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+
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+- 1/4
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+- 1/8
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+- 3/8
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+- 1/2
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+
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+
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## PVC DN standard
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mechanics-dat/mechanical-structure-dat/sheet-dat/2025-12-10-12-53-18.png
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mechanics-dat/mechanical-structure-dat/sheet-dat/sheet-dat.md
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9 9
- [[materials-dat]] - [[foam-dat]]
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+- [[cardboardboard-dat]]
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+![](2025-12-10-12-53-18.png)
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## MDF sheet
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