An adjustable assembly for a lens system comprises a lens assembly mount having a first bore and a second bore, a lens assembly that has a fixed longitudinal axis within the first bore, and an adjustable lens tube housing a second lens assembly within the second bore. The adjustable lens tube has a proximal portion, a distal portion forming a spherical joint with a distal portion of the second bore, and a longitudinal axis. A double eccentric mechanism in the second bore is in contact with the proximal portion of the lens tube, and is adjustable to pivot the lens tube within the second bore to alter the orientation of its longitudinal axis.
