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Optics / Lenses / Filters Questions

Question Asked:

I need to inspect long metal tubes used in automobiles for any presence of clinging burr inside it. Also I need to measure the OD of it on both sides. The OD of tube is 50 mm, length is of 1200 mm and ID is of 45mm. I am not able to find any lens with suitable depth of field (at least 600mm) so that the burr is visible clearly.Please suggest us the suitable lens. I am in a very bad need of the solution. I tried using normal lens of 25mm focal length in which case I had to position the camera at the distance of 1.75 meters from the object. This distance is too impractical to implement. I request you to suggest a cost effective solution in the lens or combination of lens for this problem.

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