The most common tube lens focal length used by Mitutoyo and most other manufacturers is 200mm. The magnification obtained by an infinity-corrected objective is the ratio between the focal length of the tube Lens and the objective. To find out if you need to use a tube lens with an objective, it's easy to check, infinity-corrected objectives are identified with the infinite mark ( ∞) on the side of the lens barrel. To use an infinity-corrected objective for photography, you will need a tube lens in addition to the main objective, or the system will not focus, since the tube lens is a required part of a infinity-corrected optical system. The tube lens can be a telephoto lens, a close-up diopter, or a tube lenses designed for a microscope.
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