Infinite Conjugate Tube Length
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Determine the maximum tube length in an infinite conjugate microscope system for covering a specific image sensor size without vignetting using the objective focal length, objective NA, tube lens entrance pupil diameter, tube lens focal length, and sensor size. The distance between the objective and the tube lens in an infinity corrected microscope can be varied, but this will affect the image field diameter. Using a tube length less than this maximum value will prevent vignetting.