Focusing Lens Tube, 2 inch diameter lenses

The LT20-F Focusing Tube allows axial translation of one group of lenses relative to another. The focusing tube is simply a lens tube with a longer external thread and a locking nut. Provided in 2 inch diameter, the focusing tube screws into the internal threads of a standard lens tube and is locked in place with the lock nut. The maximum focusing range is 0.89 inch. A lens retaining ring is also included with each focusing tube.