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  • 7/28/2019 Low Magnification Video Lenses

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    Low Magnification Video Lenses

    Overview

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    Overview | Optical Characteristics of Video Lenses | Determining Focal Length | Brochure

    Video lenses for machine vision inspection.

    Macro zoom lenses for close-up inspection.

    Dyotar high depth of field lenses.

    Telecentric Lenses.

    Motorized Lenses.

    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 theideal 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 thats 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 doesnt 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.

    http://web.archive.org/web/20110817094552/http:/www.machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_video_lenses.cfm?nav4=truehttp://web.archive.org/web/20110817094552/http:/www.machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_optical_character.cfm?nav4=truehttp://web.archive.org/web/20110817094552/http:/www.machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_focal_length.cfm?nav4=truehttp://web.archive.org/web/20110817094552/http:/www.machinevision.navitar.com/pdfs/cctv_brochure.pdfhttp://web.archive.org/web/20110817094552/http:/www.machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_video_lenses.cfm?nav4=truehttp://web.archive.org/web/20110817094552/http:/www.machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_optical_character.cfm?nav4=truehttp://web.archive.org/web/20110817094552/http:/www.machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_focal_length.cfm?nav4=truehttp://web.archive.org/web/20110817094552/http:/www.machinevision.navitar.com/pdfs/cctv_brochure.pdf

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    Low Magnification Video Lenses

    Optical Characteristics of Video Lenses

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    Overview| Optical Characteristics of Video Lenses | Determining Focal Length | Brochure

    Image Size

    A lens produces images in the form of a circle, called the image circle. In a camera, the imaging element has a

    rectangular sensor area (the image size) that detects the image produced within the image circle. The ratio of the

    length of the horizontal to vertical sides of a video image is called the aspect ratio, which is normally 4:3 (H:V) for

    a standard camera.

    Image

    Sensor

    Image

    Circle Horizontal Vertical

    1/4" 4.0mm 3.2mm 2.4mm

    1/3" 6.0mm 4.8mm 3.6mm

    1/2" 8.0mm 6.4mm 4.8mm

    2/3" 11.0mm 8.8mm 6.6mm

    1" 16.0mm 12.8mm 9.6mm

    Relationship Between Angle of View and Image Sensor Size

    An important factor to remember is that cameras with different image sensor chip sizes (such as 1/4", 1/3", 1/2",2/3" and 1"), using the same focal length lens, will each yield a different field of view.

    Lenses designed for a larger image sensor device will work on a new, smaller size camera. However, if a lens

    designed for a smaller format image sensor device (ie. 1/3") is placed on a larger one (ie. 2/3"), the image on the

    monitor will have dark corners.

    Image sensor sizes are in a ratio of 1:0.69:0.5:0.38:0.25. This means that a 1/2" format is 50% of a 1" format, a

    1/2" format is 75% of a 2/3" format and a 1/3" format is 75% of a 1/2" format.

    Image Sensor Size (units in mm)

    Camera to Monitor Magnification

    Camera

    Format

    Monitor Sizes (diagonal) in inches

    9" 14" 15" 18" 20" 27"

    1/4" 57.2X 88.9X 95.3X 114.3X 127X 171.5X

    1/3" 38.1X 59.2X 63.5X 76.2X 84.6X 114.1X

    1/2" 28.6X 44.5X 47.6X 57.2X 63.5X 87.5X2/3" 20.8X 32.3X 34.6X 41.6X 46.2X 62.3X

    1" 14.3X 22.2X 23.8X 28.6X 31.8X 42.9X

    Minimum Object Distance

    http://web.archive.org/web/20110820103137/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_video_lenses.cfm?nav4=truehttp://web.archive.org/web/20110820103137/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_video_lenses.cfm?nav4=truehttp://web.archive.org/web/20110820103137/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_optical_character.cfm?nav4=truehttp://web.archive.org/web/20110820103137/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_focal_length.cfm?nav4=truehttp://web.archive.org/web/20110820103137/http:/machinevision.navitar.com/pdfs/cctv_brochure.pdfhttp://web.archive.org/web/20110820103137/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_video_lenses.cfm?nav4=truehttp://web.archive.org/web/20110820103137/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_optical_character.cfm?nav4=truehttp://web.archive.org/web/20110820103137/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_focal_length.cfm?nav4=truehttp://web.archive.org/web/20110820103137/http:/machinevision.navitar.com/pdfs/cctv_brochure.pdf

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    How to Determine the Lens Focal Length Required

    Overview | Optical Characteristics of Video Lenses | Determining Focal Length | BrochureTo choose the proper lens for a particular application, the following factors must be considered:

    Field of View - The size of the area to be imaged.

    Working Distance (WD) - Distance from the camera lens to the object or area under surveillance.

    CCD - The size of the cameras image sensor device.

    You must be consistent. If you are measuring the width of your object, then use the horizontal CCD

    specifications, etc. If you are working in inches, then do your calculations in inches and convert to millimeters at

    the end.

    FL = CCD x WD / FOV

    Consider this example: You have a 1/3" C-mount CCD camera (4.8 mm horizontal). There is a 12" (305 mm)

    distance between the object and the front of the lens. The field of view, or object size, is 2.5" (64 mm). The

    conversion factor is 1" = 25.4 mm (round up).

    Calculation in mm:

    FL = 4.8 mm x 305 mm / 64 mm

    FL = 1464 mm / 64 mm

    FL = 23 mm Lens Required

    Calculation in inches:

    FL = 0.19" x 12" / 2.5"

    FL = 2.28" / 2.5"

    FL = 0.912" x 25.4 mm/inch

    FL = 23 mm Lens Required

    Please do not confuse working distance with object to image distance. Working distance is measured from the

    front of the lens to the object being viewed. Object to image distance is measured from the CCD sensor to the

    object. To calculate the lens focal length required, you must use working distance.

    http://web.archive.org/web/20110205103957/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_video_lenses.cfm?nav4=truehttp://web.archive.org/web/20110205103957/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_optical_character.cfm?nav4=truehttp://web.archive.org/web/20110205103957/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_focal_length.cfm?nav4=truehttp://web.archive.org/web/20110205103957/http:/machinevision.navitar.com/pdfs/cctv_brochure.pdfhttp://web.archive.org/web/20110205103957/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_video_lenses.cfm?nav4=truehttp://web.archive.org/web/20110205103957/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_optical_character.cfm?nav4=truehttp://web.archive.org/web/20110205103957/http:/machinevision.navitar.com/pages/product_information/low_mag_video_lens/low_mag_focal_length.cfm?nav4=truehttp://web.archive.org/web/20110205103957/http:/machinevision.navitar.com/pdfs/cctv_brochure.pdf

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