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Forget about opening an Esprit, it is extremely hard. For an Esprit I needed to remove the 16 silicon cap on top of the grub screws that itakes a hour work. Than the lenses should be removed without changing the angles between them. Once they are cleaned, the lenses need to be recnetered between each other and it is necessary to have a collimator with artificial star. Finally, the lens cell should be collimated with the focal plane.
Are you sure it is not a fungus?
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