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Optics / Lenses / Filters Questions

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Lens Selection. I am new to machine vision and need to select a lens for my project. I have used some of the lens selection tools on the internet but was not happy with the initial results. Here are the basics of my project: Camera 1/3" sensor, C-mount. Resolution 1024x768. Working distance 18". Object measurement 18"H x 24"W. The lens typically recommended is a 3.5mm lens. I purchased one and found a lot of fish eye distortion and inability to properly focus (lens already at infinity) when at 18" working distance. Field of view was ok, but focus and distortion where the problems. Any help or direction would be appreciated.

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