Arrangement for use in positioning an optical image

摘要

An arrangement for use in positioning an optical image with respect to an optical axis includes a plane optical element which is tiltable through rotation of a first rotatable ring member to deflect an image on the axis in a first plane which includes the axis and a second plane optical element which is tiltable through rotation of a second rotatable ring member to deflect the image in a second plane which includes the axis and is at an angle to the first plane.