Microscope tube lens6/7/2023 You can mount a finite microscope objective directly on your bellows with adaptors and start shooting away, but infinite microscope objectives ( like this excellent Nikon 10x here) require another lens between the objective and the camera, which is known as a 'tube lens'. To explain, there are 2 types of microscope lenses we use for extreme macro, infinite and finite ( more details here). That parallelism makes it possible to stick additional components such as filters and beam splitters into the light path, without degrading the image by adding aberrations. Tube lenses, also known as relay lenses, are a necessary component of an extreme macro setup using infinite objectives: they take a parallel optical beam coming down from an infinite objective and converge this into the sensor (or film).
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