The AOI UWL-03PROII is a wet wide-angle conversion lens designed for underwater action camera and smartphone systems that need more coverage for reefs, wrecks, large animals, and close-focus wide-angle video. In real-world diving, it is the kind of lens that helps you stay close to your subject for better color and contrast while still fitting the whole scene into the frame.
For divers using compact travel-friendly systems, this lens makes more sense than stepping up to a larger interchangeable-lens setup when the goal is cleaner, wider underwater footage with a simpler rig.
- Best for: underwater video and wide scenic shooting with action cameras or smartphone housings
- Main advantage: 140° underwater field of view with 0.73x conversion for a much wider look than a flat-port setup alone
- Compatibility note: built around the AOI Quick Release System-02 with a pre-installed QR2 mount; optional M55, M52, and M46 adapters are available
- Why buyers choose it: optical glass dome design, multi-layer AR coatings, and a depth rating to 100m
- Compared with alternatives: better suited to divers who want a premium wet lens ecosystem instead of a single-purpose fixed solution
- Tradeoff: compatibility depends heavily on your housing and front mount, so setup confirmation matters before ordering
Quick Specs
140°
150°
0.73x underwater
4 elements / 4 groups
AOI QRS-02 / QR2
100m / 328ft
400g land / 200g underwater
99mm x 40.3mm
Compatibility
Works With
- Action camera housings using the AOI Quick Release System-02
- Systems using the pre-installed QR2 mount
- Popular AD-mount compatible setups
- Selected smartphone housings that can accept the required front adapter
Requires
- A compatible housing and front-mount interface
- Correct adapter size if your system is not already set up for QR2 / AD-style mounting
- Enough clearance around the port area for the wet lens and hood
Optional Gear
- M55, M52, or M46 mounting adapter
- Tray and handle system for better stability
- Video lights for edge-to-edge wide-angle scenes
- Lanyard or lens holder for in-water handling
Important: Compatibility varies by system — contact Bluewater Photo to confirm your setup.
Example system: Action Camera or Smartphone → Compatible Housing → QR2 / AD-style Front Mount or Adapter → AOI UWL-03PROII → Wide Video Lights
Perfect For
The AOI UWL-03PROII makes the most sense for divers who want a serious wide-angle upgrade on a compact platform.
- Travel dive photographers and videographers who want to keep their system small
- Action camera shooters filming reefs, wrecks, schooling fish, and diver scenes
- Smartphone housing users trying to get a wider, more natural underwater perspective
- Divers building a flexible wet-lens system without moving into a much larger camera rig
Comparison with other Underwater Wide Angle Lenses
| Product | Wide Angle / Output | Best Use | System Compatibility | Why Choose It |
|---|---|---|---|---|
| AOI UWL-03PROII | 140° underwater / 0.73x | Action cameras and smartphone wide-angle video | AOI QRS-02, QR2, AD-compatible systems, adapter-dependent fitment | Premium optical build, 100m depth rating, strong fit for compact wet-lens workflows |
| Inon Underwater Semi-fisheye Lens for GoPro | 140° underwater | GoPro-specific underwater wide-angle shooting | ZD Front Mask mounting | A focused option for GoPro users who want a dedicated semi-fisheye solution |
| Weefine WFL14 Underwater Ultra-Wide Angle Wet Lens | 140° underwater / 1.04x | Ultra-wide compact or action camera shooting | M67xP0.75 | Worth comparing if you are prioritizing the widest possible compact-lens options |
If you are comparing AOI UWL-03PROII against options like the Inon semi-fisheye or Weefine WFL14, the smartest way to choose is by confirming your housing mount, your shooting style, and how much flexibility you want in your wet-lens system.
Why Buy from Bluewater Photo
Bluewater Photo is recognized as the #1 online retailer specializing in underwater photography and scuba diving equipment, with real-world experience supporting, selling, and configuring underwater camera systems.
- Real setup guidance from underwater photographers
- Help confirming housing, adapter, and accessory compatibility
- Practical advice based on actual dive gear workflows
- Support before and after the sale
Related Underwater Gear Categories:
- Ikelite Housings, Strobes and Accessories
- Underwater Strobes & Flashes
- Underwater Video Lights
- Snoots for Underwater Strobes
- The Best Underwater Strobes and Flashes
- Our Best Travel BCD's for Underwater Photography
- Our Best Scuba Fins for 2024
Specifications
Build
- Lens construction: 4 elements in 4 groups
- Lens coating: all glass elements with multi-layer AR coating
- Dome lens: optical-grade glass with inner surface multi-layer AR coating
- Barrel material: aluminum alloy with black hard anodized finish
- Lens hood material: polycarbonate
Imaging
- Type: underwater 0.73x wide-angle conversion lens Pro Mark II
- Field of view underwater: 140°
- Field of view on land: 150°
- Magnification underwater: 0.73x
Compatibility
- Mounting system: AOI Quick Release System-02 (QRS-02)
- Pre-installed mount: QR2
- Compatible with popular AD mount systems
- Optional adapters: M55, M52, M46
- Action camera and phone applications
Physical
- Depth rating: 100 meters / 328 feet
- Weight on land: 400g / 14.1oz
- Weight underwater: 200g / 7.1oz
- Dimensions: 99mm diameter x 40.3mm height
- Dome Lens Hard Cover (AOI DHC-02)
- Rear Lens Cap (AOI QRS-02-RC1),
- Lens Secure Line,
- Lens Pouch
FAQ
Will the AOI UWL-03PROII work with my housing?
It depends on your housing's front mount and whether it supports AOI QRS-02, QR2, or an AD-compatible connection. If your setup needs M55, M52, or M46, you will need the correct adapter.
Is this lens mainly for video or still photos?
It is especially attractive for underwater video with action cameras and smartphones, but it can also help still shooters capture wider reef and diver scenes. The main benefit is getting closer while keeping a broad field of view.
Do I need lights with this lens?
Not always, but most divers get better results with wide video lights. Once you go wider, lighting becomes more important for color and for keeping the edges of the frame looking balanced.
How is this different from a basic wide-angle add-on lens?
The UWL-03PROII is a more serious wet lens with premium glass, AR coatings, and a high depth rating. It is designed for underwater imaging performance, not just convenience.
Can I use it on land too?
The published field of view on land is 150°, so it can be used topside. Most buyers are choosing it specifically for underwater shooting.
What should I check before ordering?
Confirm your housing brand, front thread or mount type, and whether you need a QR2, AD-compatible interface, or M55/M52/M46 adapter. This is the fastest way to avoid compatibility surprises.
How do I take care of the lens after diving?
Rinse thoroughly in fresh water after each dive and dry around the mount and hood carefully. Keep the glass clean and protected during travel, especially if you are diving repeatedly on a trip.
