Kowa LM50LF-48 | 46mm Image Circle 50mm Fixed Lens, TFL-II Mount, 4K Line Scan, 7.5μm Pixel, Visible Spectrum (400–800nm)
The Kowa LM50LF-48 is a high-performance 50mm fixed focal length lens built for advanced 4K line scan camera systems. With a wide 46mm image circle and optimized support for large-pixel sensors of 7.5μm and greater, this lens is ideal for high-speed inspection, web scanning, and machine vision workflows. It features a TFL-II mount for improved stability with larger sensors, a fast f/2.8–22 manual aperture range, and exceptional resolving power up to 160 lp/mm at center and 63 lp/mm at image margins. The LM50LF-48 delivers low distortion (-0.04%) across a large sensor area, making it perfect for precise, distortion-sensitive imaging.
The lens performs in the visible spectrum (400nm–800nm), supporting full-frame line scan applications requiring maximum optical clarity. It has a field of view of 162.9mm (H) x 108.9mm (V) at the minimum working distance and provides consistent performance from 0.4m to infinity. Designed for industrial reliability, the LM50LF-48 operates across -10°C to +50°C, with a durable build measuring Ø54 x 106mm and weighing just 470g. This lens is a top-tier choice for industrial users seeking ultra-high-resolution, large-format line scan performance.
Features:
- 50mm fixed focal length lens
- TFL-II mount for secure large-format sensor use
- Supports 4K line scan cameras and 7.5µm pixel sensors
- 46mm image circle for wide sensor coverage
- Manual iris (f/2.8–22) and manual focus
- 160 lp/mm center resolution, 63 lp/mm at edge
- Minimal TV distortion (-0.04%)
- Optimized for visible spectrum (400–800nm)
- Durable build, Ø54 x 106mm, 470g
- Wide temperature range: -10°C to +50°C
Applications:
- Line scan inspection systems
- Industrial web inspection
- Print and label quality control
- Semiconductor and PCB inspection
- Large-format machine vision setups
- Scientific and research imaging
| Aperture (F-stop) | 2.8 - 22 |
| Aperture Control | Manual |
| Back Focus in Air (mm) | 37.70 |
| Focus Control | Manual |
| Field of View at Min Working Distance (H x V, mm) | 162.9 x 108.9 |
| Filter Size (mm) | M48 x P0.75 |
| Focal Length (mm) | 50.0 |
| Focus Range (m) | 0.4 – ∞ |
| Megapixel | 4K |
| Mount | TFL-II |
| Pixel Size (µm) | 7.5µm+ |
| Resolution (Center / Margin, lp/mm) | 160 / 63 |
| Sensor Size | 46mm Dia. |
| Series | LF |
| Size (mm) | Ø54 x 106 |
| TV Distortion (%) | -0.04 |
| Operating Temperature (°C) | -10 to +50 |
| Type of Lens | Fixed Focal Length |
| Wavelength Range | Visible (400 – 800nm) |
| Weight (g) | 470 |



