TECH FOCUS: OPTICS


optical axis is reduced to between 4μm and 10μm in Fujinon Anti- Shock and Vibration machine vision lenses. Te resolving power also remained stable during and aſter the vibration test, and the resolution degradation is minimised across the image. Fujifilm’s latest CF-ZA-1S


lens series uses the anti-shock and vibration technology. Tese lenses are designed for C-mount machine vision cameras, with an image sensor of up to 1.1-inch optical format and pixel pitches from 2.5µm, which equals up to 23 megapixels. Te minimum object distance is 100mm to 200mm, and the maximum chief ray angle is 4.9°. Te series has six different lens models with focal lengths from 8mm to 50mm.


Resolving power One trend taking place in machine vision is the move to larger sensor formats to increase resolution. Sischka at Edmund Optics explained during Vision 2018 that the normal way to increase sensor resolution is to fabricate smaller pixels and fit more into a certain area, but that now sensor


manufacturers are struggling to shrink pixel sizes further, so larger sensors are being released. Sony’s IMX342 31.4-megapixel global shutter CMOS sensor, for example, measures 27.9mm across the diagonal, which is too big for C-mount lenses – Lucid Vision


The shift to larger sensor formats could have significant implications for the machine vision industry


Labs’ new Atlas camera uses the IMX342 sensor. Edmund Optics recommends


the M35 mount, also known as the TFL mount, for these larger sensors, which is between C-mount and F-mount in size. Sischka commented that the shiſt to larger sensor formats could have significant implications for the machine vision industry, because lens mounts like TFL are not widely used in industrial cameras. Lucid Vision’s Atlas camera does employ a TFL lens mount.


Infrared imaging Another topic apparent at Vision Stuttgart was imaging in the shortwave infrared, the cameras for which require dedicated optics. Sill Optics was presenting telecentric objectives for the SWIR band, along with telecentric lenses with coaxial light injection and a liquid lens. Meanwhile, Midwest Optical Systems was showing its new SWIR filters, designed to enhance the image quality of InGaAs cameras operating between 900nm and 2,300nm. MidOpt was also displaying wire-grid polarisers, which are effective from 400nm to 2,000nm. Both Schneider-Kreuznach


and Resolve Optics have recently released lenses for SWIR cameras. Schneider-Kreuznach’s Swiron 2.8/50 lens has a 50mm focal length and is fitted with a C- or V-mount. Te lens is suitable for high-resolution sensors with a pixel size of up to 12.4µm and a 25.6mm image circle. Designed for working distances from 0.25m to 2.5m and with a distortion of less than one per cent, the lens is ideal for applications in pharmaceutical inspection, solar panel inspection


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IDS’s uEye LE camera family integrates Corning Varioptic’s liquid lenses


and hyperspectral imaging. Resolve Optics’ model 363 lens is a 16mm diameter SWIR lens for inspection and material sorting applications. It operates at f/1.4 with less than two per cent geometric distortion, and produces a 12.8mm diameter image at 25mm focal length. Cameras that can image from


the visible into the SWIR range are now available, such as those from Princeton Infrared Technologies or Raptor Photonics. From a lens standpoint, Sischka


remarked that maximising the optical setup for such a wide wavelength range presents some unique challenges for optics providers. O


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