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Stemmer Imaging has launched a range of compact lenses from Schneider Kreuznach.

The lenses provide a uniform distribution of light across larger-format multi-megapixel sensors and high imaging performance.

The special optical design of the new lenses delivers an even response across the entire high-resolution sensor by removing the shading effects caused by the micro lenses that form an integral part of the pixel structure, according to Stemmer.

The new lenses are designed for use with up to 8-megapixel sensors and with image formats of less than 1.3in (3.3cm).

Although megapixel image sensors use micro lenses to gather more of the available light and focus it onto the active pixel area, when the incident light arrives at a very shallow angle the micro lens will refract it so that it does not reach this area.

This is most noticeable with asymmetric pixel areas, where more light is collected along one axis, producing an unwanted shading effect.

The new high-resolution C-Mount lenses remove this effect and are optimised for use with 8-megapixel 1.3in sensors that have a large image circle of 24mm.

With a 1.3in sensor, the relatively short focal length allows a large coverage range at a short working distance.

The new lenses are available in four focal lengths, ranging from 20mm to 50mm.

The lenses are broadband coated and can be used in the visible range (400-700nm) or the near-infrared range (700-1,000nm).

The vibration-resistant construction includes an industrial-strength mount, a precision-focus fine thread, a click-stop-free iris and an iris lock with a knurled screw.

The new lenses are suitable for a range of applications, including machine vision, transport and traffic control, tube and inline inspection, defect detection and classification, 2D/3D measurement, robot vision, security and automotive crash.

STEMMER IMAGING is Europe’s largest imaging technology provider with headquarters in Germany and subsidiaries in the United Kingdom, France and Switzerland.

Image processing or Machine Vision is used in many different application areas – such as industrial automation, medical imaging, security and traffic technology – as a powerful and cost effective way of implementing automatic quality assurance. Even at high speeds and with stringent accuracy requirements, image processing allows 100% monitoring and thus strengthens the competitive edge of those companies using it.

STEMMER IMAGING customers have access to a wide variety of imaging products from the worlds leading manufacturers. These manufacturers represent the cutting edge of vision technology which is something that is unique in Europe. STEMMER IMAGING are the developers of the world’s leading image processing software platform, Common Vision Blox, and as a manufacturer of customer-specific products, we have a full range of in-house expertise to draw on, allowing us to supply the best possible service to our customers when choosing an imaging solution. STEMMER IMAGING does not produce turn-key solutions – instead, using our close partnerships with a large number of experienced system integrators, we can provide expert technical know-how for the planning, integration and realisation of complete solutions.

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