An upgrade for ALEXA, ALEXA Plus, ALEXA Plus 4:3 and ALEXA M that replaces the reflex prevention cone inside the lens cavity with a filter holder that allows the manual insertion of a PL S35 FSND (Full Spectrum Neutral Density) filter. Placing a filter between lens and sensor reduces weight, reflections and complexity. Includes: K4.40230.0 1x IFM-1 Wrench (MV 935) K5.74167.0 1x IFM-1 Reflex Tube K4.73059.0 1x IFM-1 Bottom Ring K4.74117.0 1x IFM-1 Insert Ring K2.72137.0 1x ALEXA PL S35 FSND Filter Set, Basic K2.72144.0 1x IFM/Extenders Depth Gauge DG-1 Note: This upgrade can be performed by any ALEXA customer. The basic filter set includes PL S35 FSND 0.6, 1.2 and 1.8 filters and an optical clear. The remaining five PL S35 FSND filters can be purchased in the inchFSND Filter Set - Completion inch (K2.72138.0). Not compatible with all generations of ALEXA Studio and ALEXA LF cameras.