This sophisticated housing provides everything you need to get creative with this powerful compact camera! We recommend this system for its excellent low-light capabilities and super-sharp, 24-70mm Zeiss lens. Camera Compatibility The Sony Cyber-shot RX100 Mark IV differs from the III slightly in camera thickness. The newer Mark IV camera can be used in the previous housing version made for the Mark III, Product Number 6116.12. All controls are operable in this installation with the exception of the rear control dial, which must be set to the inactive position. The rear dial control may be adjusted for the Mark IV camera by installing a washer underneath the control knob. Adjustment washers may be purchased through an Authorized Ikelite Dealer. This newer housing features improved ergonomics like a front-loading camera system and improved rear dial control. Continue reading for a full explanation of new features. The RX100 Mark III can be used in this housing with the exception of the rear control dial. Older RX100 Mark I and Mark II cameras are not usable in this housing due to differences in lens and control placement.