AOI UWL-03II Wide Angle Lens for Action Cameras and Smartphones (white)

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AOI UWL-03II-WHT 0.73x Mark II Underwater Wide Angle Conversion Lens for Action Cameras and Smartphones – White

The AOI UWL-03II-WHT is a compact underwater wide angle conversion lens specifically designed for action cameras and smartphones. With a magnification factor of 0.73x and an underwater field of view of up to 140°, it restores much of the wide angle field of view lost when using a camera behind the flat port of an underwater housing.

The white version is particularly well suited visually to white AOI underwater housings and matching QRS-02 system components.

Why use a wide angle lens underwater?

Action cameras and smartphones already offer a wide field of view on land. However, when they are placed behind the flat port of an underwater housing, refraction causes the visible field of view to become noticeably narrower. Subjects appear larger and closer, while the wide angle effect of the camera is reduced.

The underwater environment creates several additional challenges. With increasing distance between the camera and the subject, colour loss, light loss, backscatter and reduced image clarity become more noticeable.

One of the most important principles of underwater photography and video is therefore: get as close to the subject as possible.

The AOI UWL-03II-WHT Mark II allows a typical action camera to move considerably closer to the subject while still maintaining a wide field of view. This improves both image quality and the visual impact of underwater photos and videos.

Advantages of getting closer to the subject

• Reduced backscatter: A shorter shooting distance means fewer suspended particles between the camera and the subject, resulting in clearer images and videos.
• Stronger colours: Less water between the camera and the subject means less colour and light loss. When using video lights or other external lighting, colours appear more vivid and natural.
• Better detail reproduction: Small subjects can be photographed from a shorter distance and appear larger and more detailed in the frame.
• Greater visual impact: The main subject becomes more prominent and easier to distinguish from its surroundings.
• Improved stability: Working closer to the subject can make framing easier and reduce the visible effects of camera movement.
• Wide angle perspective at close range: Even when the camera is positioned very close to the subject, a large part of the surrounding environment can still be included.

140° underwater field of view

The AOI UWL-03II-WHT provides a field of view of approximately 140° underwater and up to 150° on land.

This makes the lens particularly suitable for typical underwater wide angle subjects such as:

• Coral reefs
• Fish and larger marine animals
• Divers and snorkellers
• Shipwrecks
• Underwater landscapes
• Close-focus wide angle photography
• Underwater vlogging
• Action camera underwater video
• Travel and snorkelling footage

AOI Quick Release System QRS-02

One of the key features of the UWL-03 Mark II is the AOI Quick Release System 02 (QRS-02).

The lens is supplied with a pre-installed QR2 bayonet mount. This allows the lens to be attached to or removed from a compatible QRS-02 Mount Base quickly and easily, even underwater.

The bayonet-style connection enables fast lens changes while the locking mechanism helps prevent the lens from being released accidentally.

The QR2 mount is also compatible with the widely used AD bayonet mount system, offering additional flexibility when integrating the lens into an existing underwater camera system.

Flexible mounting options

In addition to the various AOI QRS-02 Mount Bases, optional mounting adapters are available with the following thread sizes:

• M46
• M52
• M55

This allows the AOI UWL-03II-WHT to be combined with a wide range of underwater housings and camera systems. The required adapter depends on the underwater housing being used.

Compact design for action camera systems

Despite its very wide field of view, the lens remains compact. With a diameter of only 99 mm and a height of 40.3 mm, it is particularly suitable for small, lightweight and travel-friendly action camera systems.

Underwater, the lens weighs approximately 164 g, helping to keep the complete camera setup relatively compact and easy to handle.

AOI UWL-03II-WHT Specifications

Manufacturer	AOI
Model	AOI UWL-03II-WHT
Product description	Underwater 0.73X Wide Angle Conversion Lens Mark II
Colour	White
Suitable for	Action cameras and smartphones
Lens construction	4 elements in 4 groups
Lens coating	Glass lens elements with multi-layer AR coating
Front lens	Hard-coated polycarbonate
Field of view underwater	140°
Field of view on land	150°
Magnification	0.73x underwater
Mounting system	AOI Quick Release System 02 (QRS-02)
Lens mount	Pre-installed QR2 bayonet mount
Compatible bayonet system	AD Mount
Optional threaded adapters	M46, M52 and M55
Depth rating	60 m / 200 ft
Material	Aluminium alloy / polycarbonate
Weight on land	364 g
Weight underwater	164 g
Dimensions	Ø 99 × 40.3 mm

What's included

• AOI UWL-03II-WHT underwater wide angle conversion lens
• White AOI DHC-02-WHT hard dome lens cover
• AOI QRS-02-RC1 rear lens cap
• Lens secure line
• Lens pouch

AOI UWL-03II-WHT – Get closer for better underwater images

The AOI UWL-03II-WHT is an excellent upgrade for photographers and videographers using an action camera or smartphone underwater.

Its wide 140° underwater field of view allows you to move closer to your subject without sacrificing the surrounding scenery. The result is less water between the camera and the subject, reduced backscatter, stronger colours and clearer underwater images.

The compact QRS-02 bayonet system also allows the lens to be removed or attached quickly while underwater, making it particularly practical for flexible photo and video setups.

FANTIC UW-Foto – Underwater Photography Specialist in Switzerland

At FANTIC UW-Foto AG you will find underwater housings, wide angle lenses, macro lenses, video lights, underwater strobes, arm systems and accessories for action cameras, smartphones and conventional underwater camera systems.

Not sure which QRS-02 adapter is required for your underwater housing? We will be happy to help you select a compatible mounting solution for your system.

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