Nauticam NA-R5II Underwater Housing
For the Canon EOS R5 Mark II
The NA-R5II brings Canon's flagship hybrid into the water — a 45MP stacked sensor with 8K 60 RAW and 4K 120 10-bit video in one body. Built on Nauticam's N120 port system, it runs both native RF and legacy EF glass, keeps every essential control under your fingers, and ships with vacuum and leak monitoring as standard.
Consider the NA-R5II if you:
- Want the flagship hybrid — 45MP stacked-sensor stills with 8K 60 RAW / 4K 120 video
- Shoot a mix of native RF optics and legacy EF glass via the N120 port system
- Push long video sessions and want the option of the 16704 cooling fan set
- Need reliable safety monitoring for demanding dives
At a Glance
| Dimensions | 357 × 200 × 167 mm (W × H × D) |
| Depth Rating | 100 m |
| Weight in air | 3.64 kg |
| Weight in water | Positive 0.1 kg buoyancy (incl. camera and battery) |
| Port Opening | N120 |
| Compatible cameras | Canon EOS R5 Mark II |
The Camera: Canon EOS R5 Mark II
New to the R5 Mark II? Here's the context. Already know it well — skip to the housing below.
The Canon EOS R5 Mark II is the next iteration of the hugely popular R5, with considerable improvements for both stills and video. A new 45MP full-frame stacked BSI CMOS sensor pairs with DIGIC Accelerator processing for 8K 60 RAW and 4K 120 10-bit recording, while cooling vents around the LCD extend its video stamina. Next-generation Dual Pixel Intelligent AF adds Eye Control, and the RF mount keeps the 54mm diameter of the EF mount with larger rear elements closer to the sensor for sharper corners and edges.
Key camera specifications
- 45MP full-frame stacked BSI CMOS sensor
- DIGIC Accelerator processing
- Dual Pixel Intelligent AF with Eye Control
- 8K 60 RAW / 4K 60 SRAW / 4K 120 10-bit video
- Up to 30 fps with Pre-Continuous shooting
- 5.76M-dot EVF with OVF Sim. view assist
- 3.2" vari-angle touchscreen LCD
- In-camera upscaling to 179MP
- CFexpress and SD UHS-II card slots
- Wi-Fi 6E / Wi-Fi 6 support
The Housing
Lens compatibility and the N120 port system
The NA-R5II is built into Nauticam's N120 port system so you can run both native RF optics and legacy EF lenses. Fit Canon's EF-to-RF adapter to the camera before inserting it into the housing, and your port and extension-ring setup will match the Nauticam Canon N120 DSLR arrangement. Two lens-release buttons on the front — one for RF, one for EF lenses on the Canon adapter — make swapping glass through the port opening simple.
Worth noting: a control wheel on the left side of the housing interfaces with the control ring on the supported EF-to-EOS R adapter, using the optional gear (PN 19561).
Mission Control: every control within reach
Nauticam's Mission Control philosophy puts the underwater image maker in unfettered command, with controls falling naturally under the ergonomic rubberized handles. By the right handle, a dual thumb lever and dual sub-lever cover the most-used functions: the upper thumb lever fires AF-On, the lower Q, and the sub-lever drives M-Fn and Record. Near the left handle, a thumb lever controls Playback alongside a dedicated switch to toggle between the LCD and the EVF.
Large knurled, rubberized dials operate the camera's main and sub command dials, and a two-stage trigger gives smooth, separate control over focus and firing. Additional buttons — Menu, Focus Point Selection and others — remain within easy reach of the handles.
Flash triggering
Trigger strobes through the built-in fiber-optic bulkheads using one of two optional triggers: a manual LED trigger (PN 26301) or a TTL flash trigger (PN 26321), paired with optional fiber-optic cables. For strobes that don't support fiber-optic triggering, a range of legacy hot-shoe flash control bulkheads is available.
Vacuum check and leak detection — standard
Nauticam's vacuum check and leak detection electronics ship with the NA-R5II as standard. Combined with the optional 25625 M16 Vacuum Valve II, the system continuously reports the housing's watertight, safe-to-dive status through a color-coded LED: solid vacuum, or vacuum loss. Leak detection runs on the same circuit, so any water intrusion triggers an audible and visual alarm.
The system is temperature-compensated, so it won't throw false alarms from a change in water temperature or from the camera heating up on an action-packed dive.
What's in the Box
- NA-R5II Housing
- 90121 Spare main O-ring, O-ring remover and lubricant
- 2× Optical bulkhead caps
- 2× Handles with mounting balls
- Panasonic CR-2032 battery (for moisture alarm)
- Set of Allen keys
- Manual instruction card
- Padded housing bag and shoulder strap
Optional Accessories
Vacuum valves
- 25625 M16 Vacuum Valve II (pushbutton release)
Viewfinders
- 32212 Full Frame Straight Viewfinder 40° / 0.8:1
- 32214 Full Frame Angle Viewfinder 40° / 0.8:1
- 87213 Reverse Angled Viewfinder for EMWL 40° / 0.8:1
- 87214 Reverse Straight Viewfinder for EMWL 40° / 0.8:1
Triggering, cables and bulkheads
Surface power
- 26325 USB-C Bulkhead with USB-C Connector (mounts directly on the M16 port)
- 26326 M24-M16 Adaptor (for use with 26325 on the M24 port)
Cooling
- 16704 Cooling Fan Set for NA-R5II Housing
Handling
- 25413 27cm lanyard with 2 snap hooks
- 28130 Hand Strap for 28113
- 28123 Pair of Handles — size S (10mm closer to housing)
Mounting Accessories
- 25221 M10 strobe mounting ball for housing
- 25224 M10 strobe mounting ball for housing (with hole for lanyard use)
- 25228 M5 strobe mounting ball for housing
- 17959 Housing mounting ball with 1/4" screws
- 17951 Nauticam Monitor Housing Mounting System
- 17957 Nauticam Monitor Housing Mounting Adaptor
- 17954 Universal Tripod Plate for Nauticam Housings
- 17960 Universal Quadra-Pod Plate for Nauticam Housings
HDMI Configurations
HDMI 2.0 cable system
- 25086 M24 adaptor for HDMI 2.0 cable (incl. tightening tool)
- 25099 M24A2R200-M28A1R170 HDMI 2.0 cable
Compatible HDMI 2.0 monitor housings
- 17922 Nauticam Atomos Ninja V Housing — Atomos Ninja V 5" 4Kp60 4:2:2 10-bit Recorder/Monitor/Player (excl. HDMI 2.0 cable)
- 17922S Nauticam Atomos Ninja V-S Housing — as above, with Atomos AtomX SDI Module (excl. HDMI 2.0 cable)
HDMI 1.4 cable system
- 25033 Standard HDMI bulkhead with M16 thread
- 25100 HDMI (D-A) 1.4 cable, 200mm
- 26326 M24-M16 Adaptor (for use with 26325)
Compatible HDMI 1.4 monitor housings
- 17923 NA-Shinobi-H Housing for Atomos Shinobi 5.2" 4K HDMI Monitor (HDMI 1.4 input)
- 17922 Nauticam Atomos Ninja V Housing (HDMI 1.4 input; requires 25082 cable)
