The second change is that the original color wheel 1 (P/N 62326009, MAC 500 color wheel 1 w/ adaptor, magnet and filters) has been replaced with the same replaceable-filter color wheel as is used in the RoboScan Pro 918 (P/N 62326010, MAC 500/RS 918 color wheel 1 for interchangeable colors, w/ adaptor, magnet and dichroic color filters). The filter layout is identical with earlier wheels so performance is unchanged.
The third change is that the focus lens assembly has been changed to a bayonet-mount system for easier switching between the 17° and 23° options. Qualified technicians can upgrade earlier MAC 500s with the bayonet system by installing P/N 91611019, "MAC 500 bayonet-mount upgrade kit w/ 17° focus lens and 23.5° focus and front lenses." This kit includes both the upgrade to new 17° focus lens and the optional set of 23.5° lenses.
Earlier MAC 500s can be upgraded with the new gobo and color wheel by installing P/N 91611021, "MAC500 II, Effect upgrade kit." Software version 1.7 or higher is required to drive the new wheels because of their increased mass.