Sony RX100 VA + Ikelite underwater housing

First RX100 with 0.05s sec AF speed
The improved autofocus is the result of a cutting-edge AF system that combines super-fast 0.05-second AF speed and the wide, dense AF coverage employing 315 phase-detection AF points. 

Wide 315 point AF coverage
315 densely arrayed phase-detection AF points offer the world’s widest coverage (65% of new image sensor’s image area) for consistent AF and tracking, even of small, fast-moving subjects. 

Shoot continuously at up to 24fps with AF/AE tracking precision
Capture 20.1 MP high-resolution images at up to 24fps high-speed continuous shooting with AF/AE tracking for up to 150 shots. Reduced blackout makes it easier to track moving subjects on EVF/LCD screen.

4K movie shooting
4K movie recording  featuring full pixel readout without pixel binning condenses about 1.7 times as much data as is required for 4K movies so 4K movie output looks unbeatably brilliant. 

Fast Hybrid AF with wide autofocus coverage supports focusing and tracking accuracy that is outstanding enough to surpass the rigorous standards required for 4K movie shooting.

Super slow motion
The RX100 VA can record movies in super slow motion at up to 960 fps (40x normal frame rate) for twice as long as its predecessor, so you can capture more of the details that express action most memorably.

Main specifications 

• 20.1 megapixel 1" Exmor RS BSI CMOS-sensor
• BIONZ X processor and front-end LSI
• Intern UHD 4K en S-Log2 Gamma
• Zeiss Vario-Sonnar T* f/1.8-2.8 lens
• Hybride autofocussystem with 315 af points
• HFR-modus for full HD-video with max 960fps
• OLED pop-up viewfinder with 2.36 megapixels
• 3 inch tilting LCD-screen

The underwaterhousing:

Ergonomics
A new slide-in, front loading camera mounting tray makes this housing a breeze to set up and shoot. Controls are provided for all important camera functions including a re-designed, spring loaded rear dial control. Rear push button controls are laser engraved for identification with a new bright red push button for the video record start/stop. A sensitive shutter lever makes it easy to half-depress the trigger for focusing and metering.

Use the camera's built-in WiFi feature to download photos to another device without removing the camera from the housing. The WiFi feature is only usable above water within close proximity to the connected device.

Construction
There's no greater assurance than being able to see the o-ring seal. Simply close the two double-passivated stainless steel locking lid snaps, and see the o-ring form a solid black, watertight seal.

Ikelite products are designed, built and tested in the USA. We use locally sourced, top-grade materials. Our housings are built by hand and individually tested for fit, function and waterproof integrity. We back our products with over 50 years of experience and service within the dive industry.

Flash
Due to the position of the camera's flash in relation to its lens, the built-in flash is not suitable to illuminate photos under water. For the best color and clarity, we recommend adding a filter, strobe, or constant-on light. The built-in flash may be used to trigger external strobes via fiber optic sync cord. Two ports are provided for the connection of up to two fiber optic cords.

Any Ikelite DS strobe may be connected using the Fiber Optic Converter # 4401.1 and Fiber Optic Cord # 4501. The AF35 strobe is not compatible with this housing.

Lenses and filters
Our 3-inch diameter ports feature a 67mm thread on the front for the easy attachment of external wide angle and macro wet lenses. Wide angle lenses make objects appear smaller, so that you can fit more into your frame underwater. Macro close-up lenses make small objects appear larger, so that tiny creatures will fill your frame.

The WD-3 Wide Angle Dome provides mid-range angle of view with no vignetting (dark shadows in the corners of the image).

The W-30 Wide Angle Lens, INON UWL-H100, and other 67mm threaded wide angle lenses, provide a wider maximum angle of view. Because these are separated from the camera's lens by glass, air, and water, some vignetting and edge distortion will be present. These effects can be reduced or eliminated by using a smaller aperture, zooming in slightly, and/or cropping in post-production.

External macro lenses with 67mm threads from INON, Epoque, and other manufacturers, can be attached directly to the front of the housing's port.

3-inch diameter color filters press directly onto these ports. Most wide angle lenses require a 3.6-inch diameter color filter. Refer to the product page for information on color filter compatibility.

Specifications 

• 200 ft (60m) depth rating
• Controls for all camera functions except Flash switch and Viewfinder switch
• Slightly negative buoyancy in fresh water
• 1/4-20 thread tray mounting with 3 in (76mm) spacing
• Weight 2.6 lb (1180 g)
• Dimensions 6.8 x 5 x 5.4 in (173 x 127 x 137 mm)
• 3.0-inch diameter glass lens port 

Manufacturers user manual