SeaLife Macro Lens 67mm +6: What it enables, and what it doesn't solve.

Underwater macro photography is one of the most demanding areas of underwater photography. Not because the equipment is complicated, but because everything happens just 5 centimeters away from a living subject, in an environment that is constantly moving, with a photographer who is breathing and moving.

The SeaLife 67mm +6 macro lens opens up this possibility for smartphones when used with the SportDiver underwater housing. It's important to understand what it offers and what limitations it has.

A +6 diopter close-up lens is placed in front of the existing optics of the camera body and modifies its minimum focus distance. Without the lens, the SportDiver focuses from a certain distance, making macro photography impossible. With the +6 lens, this distance decreases to 5 centimeters from the lens.

At a distance of 5 centimeters, a nudibranch measuring 3 cm in length fills a significant portion of the frame. A pygmy seahorse on a gorgonian becomes perfectly visible. A clutch of eggs on coral can be photographed with enough detail to identify the species.

The lens is compatible with a 67mm port. It attaches via the SportDiver lens adapter - an accessory sold separately if you don't already have one. It is also compatible with any other housing that accepts a 67mm thread.

The use of a macro lens on a smartphone within a SeaLife housing has a structural limitation: autofocus.

The SeaLife application does not allow you to manually lock the focus on a specific point. When shooting in macro mode at a distance of 5 centimeters, the depth of field is only a few millimeters. The autofocus system automatically chooses which millimeter to focus on.

On a completely still subject against a neutral background, the autofocus can usually perform well. However, when photographing a nudibranch that is moving slowly against a background filled with gorgonians, or a pygmy seahorse where the eye is hidden behind a coral branch, the autofocus often selects the wrong focus point.

This is a limitation that the macro lens does not resolve. It's a limitation of the proprietary application and the SportDiver system.

For cooperative subjects – such as fixed egg clusters, slow-moving nudibranchs, sponges, and algae – the combination of a SportDiver camera + a 67mm macro lens + a +6 diopter produces acceptable results. For an underwater photographer who wants to occasionally explore macro photography without investing in a dedicated compact camera with a macro port, this is an accessible option.

If macro photography is your primary focus, a waterproof compact camera with manual controls or a housing that allows the phone's native app to remain active (and thus provides autofocus lock) will yield better results and less frustration.

At AquaExposure, we teach macro photography with active focus control. This is a skill that requires practice, and to practice it, you need to be able to choose your focal point.

• Overview of the 7 new SeaLife products from July 1, 2026
• Macro photography of nudibranchs: technique and approach
• iPhone + DiveVolk: access to manual control underwater
• AquaExposure Training