Kowa
Kowa LM75HC 75mm F1.8 C-Mount 2MP Lens
A precision-engineered 75mm C-mount lens delivering low-distortion 2MP imaging for industrial and machine vision.
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Overview
Achieve Precision Imaging with the Kowa LM75HC 1" 75mm Lens
The Kowa LM75HC is a high-quality 1" 75mm lens designed for precision imaging applications. With a manual iris, C-mount, and low distortion, this lens is rated for 2 megapixels and delivers excellent resolution and clarity. Ideal for industrial and machine vision applications requiring accurate and detailed imaging.
Specifications
- Format: 1"
- Focal Length: 75mm
- Aperture: F1.8
- Iris Type: Manual Iris
- Mount: C-Mount
- Resolution: 2 Megapixel
- Focusing Range: 1.0 ~ ∞
- Angle of View 1": 9.7 x 7.3
- Angle of View 2/3": 6.68 x 5.03
- Angle of View 1/2": 4.8 x 3.6
- Resolution (Center, Corner): 120lp/mm, 80lp/mm
- TV Distortion: -0.2
- Back Focus in Air: 14.5 mm
- Filter Thread Size: M46 x P0.75
- Minimum Focus Distance: 1 m
- Flange Back in Air: 17.526 mm
- Size: Φ49 x 57 mm
- Weight: 180 g
- Temperature Range: -10 ~ +50 °C
Pros & Cons
👍 Pros
- Extremely low TV distortion at -0.2% ensures accurate geometry for measurement and inspection tasks
- Center resolution of 120 lp/mm delivers sharp, detailed imaging across the field of view
- Compact design at just 49mm diameter by 57mm length and 180g weight fits into tight system integrations
- Wide operating temperature range of -10°C to +50°C supports use in factory floor and outdoor environments
- F1.8 maximum aperture allows effective imaging in lower light conditions
👎 Cons
- Manual iris only — no auto iris option limits use in applications with rapidly changing lighting
- 75mm focal length produces a narrow field of view (9.7° x 7.3° on 1-inch sensor), restricting use to specific long-range applications
- 2-megapixel rating will not fully resolve detail for higher-resolution cameras common in newer vision systems
- Minimum focus distance of 1 meter prevents close-up inspection work
- M46 filter thread is an uncommon size that may require adapters for standard filter accessories
Frequently Asked Questions
What camera mount does the Kowa LM75HC use?
The LM75HC uses a standard C-mount, making it compatible with a wide range of industrial, machine vision, and scientific cameras that accept C-mount lenses.
What sensor size is the Kowa LM75HC designed to cover?
It is designed for 1-inch format sensors, though it also provides specified fields of view for 2/3-inch and 1/2-inch sensors at narrower angles.
Does the LM75HC have an auto iris or is it manual?
The LM75HC features a manual iris. Exposure adjustments must be made by hand on the lens barrel rather than through camera-controlled iris automation.
What is the minimum focus distance of this lens?
The minimum focus distance is 1 meter (approximately 3.3 feet), so it is designed for mid-range to distant subjects rather than close-up macro work.
What resolution is the Kowa LM75HC rated for?
It is rated for 2 megapixels, with a center resolution of 120 line pairs per millimeter and a corner resolution of 80 lp/mm.
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