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A Closer Look at Resolution Testing

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From reverse projection to modulation transfer function testing, there is more than one way to evaluate the resolution of a lens.

Patrick McKenna, edmund optics inc.

In the days of VGA video cameras and predominantly analog storage, it was easy to make an imaging lens that would outperform the camera’s ability to capture an image. That’s no longer the case. Where 640 pixels once stood, it is not uncommon today to see 6 million. Cameras continue to offer smaller pixels (and more of them), and all machine vision users — from the largest integrators to the lone person in the lab — want to get the most out of this plethora of pixels. Lens manufacturers have had to up their offerings, pushing the limits of optics, mechanics, and design...Read full article

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