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Focus limits is a safety device, it is used to limit focus travel to the safe range. Focus limits is an assembly of two optical switches and a flag. The flag has an adjustment screw, which is set so that objective is prevented from crashing into the slide. Switch assembly is mounted on the microscope column and flag is mounted on the stage support block. Focus limits fulfill the safety function only when focus is driven by the motor. If the coarse focus knob is turned manually, focus limits will not block the travel. |