Optiques Vidéo à Faibles Grossissements

• Lentilles vidéo pour machine de vision inspection
• Lentilles macro-zoom pour inspection rapprochée
• Lentilles longue profondeur de champ Dyotar
• Lentilles télécentriques
• Lentilles motorisées

All Video Lenses are Not Created Equal

Navitar and Fujinon video lenses are the benchmark against which all lenses should be measured. Quality construction, coupled with precision engineering, result in video optics that are sharp, high resolution and optically precise.

We offer a complete range of video lenses for every industrial application. Video lenses from Navitar are the ideal choice for applications ranging from PC board inspection to viewing glass bottles on a production line.

Video Lens Selection

There are a growing number of video imaging applications in which a single, constant magnification factor and a fixed working distance are required in order to maximize contrast and performance. Navitar has responded to this need with a wide range of fixed focal length lenses.

Determining the necessary parameters for video lens selection, including focal length, field of view and image sensor size, does not need not be an intimidating process. An understanding of some basic optical terms and relationships is all that’s required.

The information on the following pages will help you select the lens that will work best for your application. If you require further assistance, please feel free to call Navitar and speak directly to one of our engineers.

Understanding Focal Length and f/number

Video lenses can be classified into three categories according to focal length: standard, wide angle and telephoto. Focal length is the distance between the camera sensor and the center of the lens. The greater the focal length, the larger the image will appear. Therefore, the greater the focal length, the more the lens becomes telephoto in application.

Standard Lens - A standard lens doesn’t change the size of the object being viewed.

Wide Angle Lens - A wide angle lens provides a wider field of view and therefore a smaller image of the object being viewed than a standard lens.

Telephoto Lens - A telephoto lens produces a larger image of a distant object. The longer the focal length, the larger the object will appear.

The f/number is an indication of the brightness of the lens. It is the measurement of the ratio between the focal length and the diameter of the entrance pupil (where the light enters the lens). The f/number is directly proportional to the focal length and inversely proportional to the effective diameter of the lens. It determines the amount of light reaching the camera sensor. The smaller the value, the larger the opening and the brighter the image produced by the lens.