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VS-LDA20
LDA Series is design for producing low distortion image even when using with extension tubes 10 models from focal lengths f4mm～f75mm with reduced shading. Consistence Compact size: of 32mm in diameter (except for VS-LD 6.5). For VGA ～3 Megapixel sensors
| Model | VS-LDA20 | ||||
|---|---|---|---|---|---|
| Focal Length | 20mm | ||||
| Maximum Aperture Ratio | 1:2.0 | ||||
| Optical mag. range | x 0.04 ~ × 0.22 | ||||
| Optical mag. | x 0.04 | x 0.08 | x 0.15 | x 0.22 | |
| 2/3" | 177.5 × 210.0 | 88.8 × 105.0 | 47.3 × 56.0 | 32.3 × 38.2 | |
| FOV (VxH mm) | 1/2" | 120.0 × 160.0 | 60.0 × 80.0 | 32.0 × 42.7 | 21.8 × 29.1 |
| 1/3" | 90.0 × 120.0 | 45.0 × 60.0 | 24.0 × 32.0 | 16.4 × 21.8 | |
| WD | 510.3mm | 251.3 mm | 130.5 mm | 86.6 mm | |
| O/I (Object & Imager distance) | 558.8mm | 300.6 mm | 181.3 mm | 138.8 mm | |
| Working F/# *Value at Iris open | 2.1 | 2.2 | 2.3 | 2.3 | |
| TV distortion | -0.01 % | -0.05 % | -0.12 % | -0.17% | |
| Operation of Iris & Zoom | Manual (Lock crew M2) | Manual (Lock crew M2) | Manual (Lock crew M2) | Manual (Lock crew M2) | |
| Wavelength | Visible | Visible | Visible | Visible | |
| Camera mount | C-mount | ||||
| Flange Back | 17.526 mm | ||||
| Sensor size (max.) | 2/3" | ||||
| Filter Thread | M 27 P= 0.5 | ||||
| Weight (approx.) | 47 g | ||||
| Dimension | Φ 30.5 (MAX) × | L = 31.0 (×0.04) | ~ 34.7 (×0.22) mm |
| Lens Model | VS-LDA20 | |||
|---|---|---|---|---|
| Extension Ring (mm) | WD Minimum(mm) | WD Maximum (mm) | Mag @ Min WD | Mag @ Max WD |
| 0.5 | 77.3 | 316.1 | 0.064x | 0.244x |
| 1.0 | 69.7 | 227.8 | 0.088x | 0.268x |
| 1.5 | 63.4 | 177.4 | 0.112x | 0.292x |
| 2.0 | 57.8 | 143.6 | 0.137x | 0.317x |
| 5.0 | 37.4 | 66.1 | 0.281x | 0.461x |
