{"id":61,"date":"2016-07-25T16:20:00","date_gmt":"2016-07-25T16:20:00","guid":{"rendered":"https:\/\/www.1stvision.com\/machine-vision-solutions\/2016\/07\/25\/advantages-of-telecentric-lenses-in-machine-vision-applications\/"},"modified":"2024-01-04T10:31:02","modified_gmt":"2024-01-04T15:31:02","slug":"tutorial-advantages-of-telescentric-lenses","status":"publish","type":"post","link":"https:\/\/www.1stvision.com\/machine-vision-solutions\/2016\/07\/tutorial-advantages-of-telescentric-lenses.html","title":{"rendered":"Advantages of Telecentric lenses in machine vision applications"},"content":{"rendered":"
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Telecentric lenses<\/span>\u00a0<\/a>are essential in eliminating distortion errors caused by standard lenses in machine vision applications. \u00a0<\/span><\/p>\n

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\n<\/span>Telecentric lenses are defined by lenses only\u00a0accepting\u00a0incoming light ray bundles whose principal\u00a0rays are parallel to the optical axis of the lens as seen in the diagram below<\/span>
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View Telecentric lenses here<\/a><\/b><\/span><\/div>\n
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Key advantages to a Telecentric lens are constant magnification, no\u00a0perspective\u00a0error\u00a0and very low\u00a0distortion<\/b><\/span><\/div>\n

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1st Vision can specify the right telecentric lens for your application! \u00a0 – \u00a0 \u00a0Contact us!<\/a><\/span><\/u><\/b><\/span><\/div>\n


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\n<\/span><\/u><\/b>How do the advantages of telecentric lenses help in machine vision applications? \u00a0<\/u><\/b><\/span>
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\n<\/u><\/b><\/span>Constant Magnification<\/span><\/u><\/b>
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\n<\/span>Telecentric lenses can provide constant magnification, and not influenced by varying lens to object distances. \u00a0<\/span>
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\n<\/span>Example:\u00a0<\/i><\/u><\/span>The image to the right shows 2 screws in which the 2nd screw is 10mm further away from screw 1 when viewed from the Telecentric lens in the setup.<\/span>
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\n<\/span>Using a standard lens, screw #1 which is closer will appear to be larger<\/span>
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\n<\/span>Using a Telecentric lens, the screws look the same size and not influenced by the lens to object distance. \u00a0<\/span>
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This is very helpful in applications to ensure accurate measurements negating any deviations from part placement.
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\n<\/span>Perspective Error<\/u><\/b><\/span>
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\n<\/b><\/span>Standard lenses show significant perspective errors, whereas telecentric lenses are able to eliminate any perspective effects. \u00a0In cases where measurements are critical, using a telecentric lens is a must!<\/span><\/p>\n

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\n<\/span>Low Distortion<\/span><\/u><\/b>
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\n<\/span><\/u><\/b>Regular lenses have 1-2% distortion, whereas telecentric lenses have 0.1%<\/span><\/p>\n

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\n<\/span>Regular lens will either have “Barrel” (left image) or “Pin cusion” distortion (right image)\u00a0<\/span>
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\n \u00a0 \u00a0 Barrel Distortion \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Pin Cushion Distortion<\/u><\/span><\/p>\n

In barrel distortion, image magnification decreases with distance from the optical axis. <\/span>This is common in fish-eye lenses. \u00a0<\/span><\/p>\n

In pincushion distortion, image magnification increases with the distance from the optical axis. \u00a0<\/span>
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\n<\/span>Using telecentric lenses in machine vision applications will eliminate barrel and pin cusion distortion. \u00a0<\/span>Low distortion is imperative where accuracy is required. \u00a0<\/span>
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\n<\/span>How can it get any better! \u00a0– Use Collimated light!<\/span><\/u><\/b>
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\n<\/span>Telecentric lenses provide a high level of accuracy, but when coupled with a collimated light source, edge definition is increased.<\/span>
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\n<\/span>Diffused backlights can generate unwanted border effects and create a “fake” image of the edge of a part. \u00a0Collimated backlights allow only parallel rays to pass by objects. \u00a0This setup would be setup like the diagram below. \u00a0<\/span>
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\n<\/span>The result is very crisp edge definition as seen in the images below. \u00a0The left image is using a standard backlight in which light “wraps” around the cap. \u00a0The right images use a collimated back light providing excellent edge definition.<\/span>
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Contact 1st Vision to help specify the right telecentric lens and lighting for your application!<\/a><\/b><\/span><\/div>\n
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View full specifications for Telecentric lenses<\/a><\/b><\/span><\/div>\n<\/div>\n
Images\u00a0courteously\u00a0of Opto Engineering!<\/b><\/a><\/span>1st Vision<\/a>\u00a0<\/b>has extensive knowledge in industrial imaging\u00a0and can help answer any questions. \u00a0We have over 100 years of combined knowledge and look forward to discussing your application. \u00a0<\/span><\/span>Please do not hesitate to\u00a0Contact us<\/a><\/b>! \u00a01st Vision can provide a complete solution including cameras, lenses, lighting and cables. \u00a0<\/span><\/span>
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\n<\/span>Ph:\u00a0 978-474-0044<\/b><\/span>
\ninfo@1stvision.com<\/a><\/b><\/span>
\nwww.1stvision.com \u00a0<\/a><\/b><\/span>
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\n<\/span><\/b>Follow us on Social Media!<\/span><\/b><\/p>\n
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\"<\/a>\u00a0\u00a0\u00a0 <\/span>\"https:\/\/www.facebook.com\/pages\/1st-Vision\/944658058935262?fref=ts\"<\/a>\u00a0\u00a0\u00a0 <\/span>\"<\/a>\u00a0\u00a0\u00a0 <\/span>\"<\/a>\u00a0\u00a0\u00a0 <\/span>\"<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Telecentric lenses\u00a0are essential in eliminating distortion errors caused by standard lenses in machine vision applications. \u00a0 Telecentric lenses are defined by lenses only\u00a0accepting\u00a0incoming light ray bundles whose principal\u00a0rays are parallel to the optical axis of the lens as seen in the diagram below View Telecentric lenses here \u00a0 Key advantages to a Telecentric lens are … <\/p>\n

Continue reading “Advantages of Telecentric lenses in machine vision applications”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[51,61],"tags":[],"class_list":["post-61","post","type-post","status-publish","format-standard","hentry","category-lenses","category-tutorial"],"yoast_head":"\nAdvantages of Telecentric Lenses for Machine Vision | 1stVision<\/title>\n<meta name=\"description\" content=\"Consider the advantages of telecentric lenses for machine vision, including precise measurements and distortion-free images. 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