Selection Guides
How to Choose a Telecentric Lens for Measurement
Published
Four steps from field of view, sensor size and magnification to working distance to lock in the right telecentric lens.
Step 1: Define the field of view
Measure the largest dimension of your part and add 10%–20% margin for placement tolerance to get the required field of view.
Step 2: Match the sensor format
Magnification = sensor size ÷ field of view. Divide the long edge of the sensor by the long edge of the FOV to get the minimum magnification you need.
Step 3: Check the resolution
Object-space resolution = pixel size ÷ magnification. Confirm this value is better than one third of your measurement tolerance.
Step 4: Confirm working distance and depth of field
Pick the working distance that fits your mechanical layout, then verify the depth of field covers the height variation of the part.
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