Lenses (for Machine Vision)

CA-L series

Distortion-free, VPR-equipped, Telecentric Macro Lens

CA-LMHR Series

VPR equipped

With conventional telecentric macro lenses, the selections were limited and depended on the characteristic optical magnifications of the lenses. The VPR (Variable Pixel Resolution) mechanism not only makes it possible to select lenses intuitively according to the pixel resolution but also brings a level of freedom to the range over which optical magnification can be adjusted.

* These lenses are designed with optical magnification to match 5 megapixels (3.45 μm/pixel) and 2 megapixels (4.4 μm/pixel).

Distortion free

All models have a TV distortion of 0.02% or lower. This reduces distortion to 0.25 pixels or less over the entire image even for a 5 megapixel camera. These lenses are the perfect choice for a wide range of applications from dimension measurement to alignment.

Ultra high-resolution design

These lenses have been designed with consistently high resolution not only in the centre of the image but on its periphery as well. Even with a unit cell size of 3.45 μm/pixel, every part of the screen exhibits high resolution and contrast.

CA-LMHR

Even for the most detailed part of the chart, sufficient contrast between the white and black lines is obtained.

CA-LM

Because the resolution is insufficient, the contrast is extremely low, which makes it impossible to sufficiently recognise the edges.

Specifications

Distortion-free, VPR-equipped, Telecentric Macro Lens

Model

CA-LMHR04*1

CA-LMHR08*1

CA-LMHR13*1

CA-LMHR20*1

CA-LMHR40*1

Optical magnification

x0.35 to x0.44

×0.69 to ×0.88

×1.15 to ×1.47

×1.73 to ×2.20

×3.45 to ×4.41

Max. compatible image/CCD size

2/3"

Field of view

2/3":
Low magnification 24.0 × 20.2 mm, High magnification 19.1 × 16.1 mm
1/1.8":
Low magnification 20.1 × 15.1 mm, High magnification 16.0 × 12.0 mm

2/3":
Low magnification 12.2 × 10.3 mm, High magnification 9.5 × 8.0 mm
1/1.8":
Low magnification 10.2 × 7.7 mm, High magnification 8.0 × 6.0 mm

2/3":
Low magnification 7.3 × 6.2 mm, High magnification 5.7 × 4.8 mm
1/1.8":
Low magnification 6.1 × 4.6 mm, High magnification 4.8 × 3.6 mm

2/3":
Low magnification 4.8 × 4.1 mm, High magnification 3.8 × 3.2 mm
1/1.8":
Low magnification 4.1 × 3.1 mm, High magnification 3.2 × 2.4 mm

2/3":
Low magnification 2.4 × 2.1 mm, High magnification 1.9 × 1.6 mm
1/1.8":
Low magnification 2.0 × 1.5 mm, High magnification 1.6 × 1.2 mm

F-stop range (aperture)

Low magnification: 4.4 to 18, High magnification: 5.5 to 22

Low magnification: 5.6 to 23, High magnification: 7.1 to 29

Low magnification: 5.7 to 38, High magnification: 7.3 to 49

Low magnification: 6.8 to 43, High magnification: 8.7 to 55

Low magnification: 8.6 to 183, High magnification: 11 to 234

Resolving power

Center/periphery: 120 cycles/mm

centre/periphery : 120 cycles/mm

Center/periphery: 120 cycles/mm

WD

Low magnification: 112.7 mm, High magnification: 112.7 mm*2

Low magnification: 111.0 mm, High magnification: 111.0 mm*2

Low magnification: 111.6 mm, High magnification: 111.6 mm*2

Low magnification: 114.8 mm, High magnification: 109.4 mm*2

Low magnification: 65.9 mm, High magnification: 65.9 mm*2

TV distortion

Low magnification: 0.02%, High magnification: 0.01%

Low magnification: 0.005%, High magnification: -0.001%

Low magnification: 0.011%, High magnification: -0.015%

Low magnification: 0.001%, High magnification: 0.011%

Low magnification: 0.015%, High magnification: -0.002%

Depth of field

Low magnification: 10.449 mm, High magnification: 6.612 mm*3

Low magnification: 2.689 mm, High magnification: 1.653 mm*3

Low magnification: 0.968 mm, High magnification: 0.592 mm*3

Low magnification: 0.428 mm, High magnification: 0.264 mm*3

Low magnification: 0.108 mm, High magnification: 0.066 mm*3

Mount

C-mount

Pixel resolution
(US 3.5 µm: low magnification to US 4.4 µm: high magnification)

10 µm/pixcel*4

5 µm /pixel*4

3 µm /pixel*4

2 µm /pixel*4

1 µm/pixcel*4

Resolution

8.39 µm*5

5.4 µm*5

3.3 µm*5

2.6 µm*5

1.68 µm*5

Environmental
resistance

Ambient temperature

0 to 50°C

Relative humidity

35 to 80% RH (No condensation)

Weight

Approx. 400 g

Approx. 285 g

Approx. 330 g

Approx. 410 g

Approx. 650 g

*1 The above values were calculated according to optical design values. Actual values for individual lenses will differ according to precision of assembly.
*2 WD indicates the distance from the tip of the lens to the workpiece. Changing the magnification changes this distance.
*3 The depth of field is a theoretical value calculated with an F-stop of 16 and a circle of least confusion of 40 µm.
This varies depending on the F-stop.
*4 The pixel resolution is the field of view per pixel. This varies depending on the camera used.
US = Unit cell size (size of 1 pixel)
The CA-LMHR Series can also be used at pixel resolutions other than those listed here depending on the optical magnification.
*5 The smallest resolvable feature able to be detected under 550 nm wavelength light.

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