Newport BA-3 Base (1.75 inches tall, for FH-1 Filter Holder

This Newport item consists of two components. The first is the BA-2 round flanged base. It may be used to place the FH-1 filter holder module optic axis at a height of 2 inches (height of flanged base is 0.75 inches). The second component is a 1 inch cylindrical spacer that converts the BA-2 base into a BA-3 base, lifting the optic axis height to 3 inches. The components may be separated easily to convert to the BA-2 base.