This is a straightforward underwater macro wet lens for photographers who want more magnification from a compatible housing and port without moving immediately into a more specialized super-macro system. It is particularly useful when you want a compact lens that can be installed and removed underwater and can also be stacked when you need additional magnification.
Best For
Compact, mirrorless and other underwater camera systems that can accept a compatible 67mm threaded macro wet lens, particularly for nudibranchs, small fish, shrimp and other small subjects.
Main Advantage
A useful balance of +7 close-up strength, compact size and underwater flexibility, with the added ability to stack two lenses when you want to move into more demanding super-macro shooting.
Compatibility
Uses a 67mm threaded mount. Your underwater housing port or wet-lens adapter must provide the appropriate 67mm attachment point.
Important to Know
More magnification also means more demanding focusing, framing and camera stability. Before ordering, confirm that your housing, port or flip adapter supports a 67mm threaded wet lens.
Quick Specifications
| Lens Type | Underwater macro wet lens / close-up lens |
|---|---|
| Diopter Strength | +7 |
| Optical Design | Two-element achromatic optical-glass design |
| Mount | 67mm threaded |
| Coating | UV coated and anti-reflective |
| Stackable | Yes — two Bluewater +7 lenses can be stacked for greater magnification |
| Underwater Optical Strength | Designed to retain its magnification underwater |
What You Need to Know
Compatibility
The lens uses a 67mm threaded attachment. Some underwater housings and macro ports already provide a 67mm thread, while others require a separate adapter or flip holder. Compatibility should be checked for your specific housing and port combination.
What You'll Need
You need an underwater housing and port or wet-lens adapter capable of accepting a 67mm threaded macro lens. A compatible flip adapter can make switching between normal and macro shooting much quicker underwater, but is not required when the lens can be threaded directly onto the port.
Who Should Choose It?
Choose the Bluewater +7 if you want a compact, moderately strong wet macro lens with simple 67mm compatibility and the option to stack lenses later. Photographers chasing extremely small subjects may prefer a stronger dedicated super-macro lens instead.
Bluewater +7 Macro Lens Overview
Wet macro lenses are one of the easiest ways to expand the capabilities of an underwater camera system. Rather than committing to one close-up configuration for an entire dive, you can add the Bluewater +7 when you find a small subject and remove it when you want to return to the camera's normal working range.
The Bluewater +7 uses a two-element achromatic optical-glass design rather than a simple single-element close-up lens. Its optical elements are UV coated and anti-reflective, and the lens is designed to retain its magnifying strength underwater.
The low-profile 67mm threaded body also keeps the system relatively simple. One lens is a practical starting point for conventional underwater macro; photographers who want to push toward smaller subjects can stack two Bluewater +7 lenses for increased magnification.
Key Features
- +7 close-up strength increases magnification for photographing smaller underwater subjects.
- Two-element achromatic optical design is intended to provide better image quality than a basic single-element close-up filter.
- Optical-glass construction provides the optical foundation for detailed underwater macro images.
- 67mm threaded mount works with many underwater ports and wet-lens adapters built around the common M67 system.
- Low-profile construction keeps the lens compact on the front of the housing.
- Stackable design lets you combine two Bluewater +7 lenses when a single lens does not provide enough magnification.
- Wet-lens flexibility allows the lens to be installed or removed during the dive when your housing setup permits.
What's Included
Included
Package contents includes a single Bluewater +7 Macro Lens.
Sold Separately / May Be Required
- Compatible underwater housing
- 67mm compatible port or wet-lens adapter when required
- Optional compatible flip adapter for faster underwater lens changes
Turn Small Subjects Into the Main Subject
Adding a macro wet lens reduces the camera's effective close-focus working range and increases the size of small subjects in the frame. That makes the Bluewater +7 useful for subjects that would otherwise occupy only a small portion of the photograph.
- Fill more of the frame with nudibranchs, shrimp and other small marine life.
- Capture finer subject detail without relying as heavily on cropping afterward.
- Remove the wet lens during the dive when you want to return to less magnified shooting.
Stack Two Lenses for Super Macro
A single +7 lens is a useful general-purpose macro option. When the subject becomes significantly smaller, a second Bluewater +7 can be stacked onto the first lens to increase magnification.
- Start with one lens instead of committing immediately to a stronger super-macro optic.
- Add a second lens when you need more magnification for very small subjects.
- Keep in mind that stronger magnification makes focus, composition and stability more demanding.
67mm Threading Keeps Your System Flexible
M67 is widely used for underwater wet-lens attachments, making the Bluewater +7 relatively easy to integrate into many existing underwater systems. The important detail is the thread available on your actual port or adapter—not simply the camera or housing model.
- Direct-thread installation is possible on compatible 67mm ports.
- Adapters are available for many systems that do not have native 67mm threads.
- Flip holders can provide a faster way to move the lens in and out of the optical path.
Best Uses for the Bluewater +7 Macro Lens
Nudibranch Photography
A good fit when you want small nudibranchs to occupy more of the image while preserving detail.
Small Fish & Invertebrates
Useful for shrimp, tiny crabs, small gobies and other subjects that are difficult to fill the frame with using the camera lens alone.
Compact-Camera Macro
Particularly useful for compatible compact-camera housings where adding and removing a wet lens gives you more shooting flexibility during the same dive.
Entry into Super Macro
Start with one +7 lens and add a second later if you want more magnification without replacing your original lens.
How Does It Compare?
The most important comparison is not simply which macro lens has the highest diopter number. Stronger lenses can produce more magnification, but they also make focusing, working distance and composition more demanding. Choose based on the size of subjects you normally photograph and how much magnification you realistically need.
| Option | Magnification Level | Ease of Use | Best For |
|---|---|---|---|
| Single Bluewater +7 | Moderate close-up strength | More forgiving than very high-magnification configurations | General underwater macro and smaller subjects |
| Two Stacked Bluewater +7 Lenses | Higher magnification | More demanding focusing and stability | Super macro and very small subjects |
| Higher-Power Dedicated Macro Wet Lens | Typically stronger | Usually more specialized and demanding | Photographers who regularly prioritize maximum magnification |
Sample Images:
Bluewater +7 macro lens, Canon G16, dual YS-D1 strobes. Photo by Joshua Musselwhite
Fantasea G16 + Bluewater +7 macro lens, photo by Joshua Musselwhite
Canon G16, Bluewater +7 macro lens; F8, 1/1600th, ISO 100. Tiny corynactis anemone
Taken with the Canon S100, Bluewater +7 macro lens, photo by Aaron Halstead
Frequently Asked Questions
What does +7 mean on a macro lens?
+7 refers to the close-up power of the lens in diopters. In practical terms, it allows a compatible camera system to focus closer and produce greater subject magnification.
Is the Bluewater +7 Macro Lens a wet lens?
Yes. It is an underwater wet macro lens designed to mount in front of a compatible underwater housing port or wet-lens adapter.
What thread size does the Bluewater +7 use?
The lens uses a 67mm threaded mount. Confirm that your port or adapter provides the appropriate 67mm attachment before ordering.
Can I stack two Bluewater +7 Macro Lenses?
Yes. The Bluewater +7 is designed to be stackable, allowing two lenses to be combined when you need greater magnification for super-macro photography.
Is stacking two macro lenses harder to use?
Generally, yes. Greater magnification makes accurate focus, framing and camera stability more demanding, so many photographers start with one +7 before moving to a stacked setup.
Will the Bluewater +7 work with my underwater housing?
It depends on the port or wet-lens adapter used with your housing. If your system does not have a native 67mm thread, a compatible adapter may be available.
Can I remove the lens underwater?
A wet lens is designed to be used as an external underwater optic, so compatible systems allow it to be attached or removed during a dive. A flip adapter can make this quicker when available for your housing.
Should I choose the Bluewater +7 or a stronger macro lens?
The +7 is a good option when you want useful macro magnification without immediately moving to a more demanding high-magnification lens. If very small super-macro subjects make up most of your photography, a stronger dedicated lens may be more appropriate.
