Marelux Apollo III 3.0 Underwater Strobe

GN44 power, a 0.6-second full-power recycle and high-speed MTL burst shooting for photographers who need wide, powerful light without waiting for the strobe to catch up.

The Marelux Apollo III 3.0 is Marelux's flagship underwater strobe, built around a GN44 flash, a wide 120° beam and an unusually fast 0.6-second recycle at full output. Its real advantage shows up when photographing fast marine life, wide-angle reef scenes, blackwater subjects or any situation where a slower strobe forces you to wait between frames.

It also supports Marelux's MTL burst mode, TTL, HSS, RC and PRE-M workflows, but advanced automatic modes depend on the camera, housing and flash trigger being able to provide the correct signal. If you're building a system rather than replacing an existing strobe, we recommend confirming the complete trigger path before ordering.

• Best for: serious wide-angle, wildlife, blackwater and high-speed underwater still photography.
• Main advantage: GN44 output with a manufacturer-specified 0.6-second full-power recycle.
• Burst advantage: MTL mode supports 20 fps at GN22 with a 0.05-second recycle specification.
• Compatibility: Universal compatibility – including OFF, TEST, MANUAL, TTL, HSS, RC, PRE-M, and MTL mode dial,works with all major cameras and flash modes
• Major differentiator: combines fast flash recycling with a 120° beam, 3,000-lumen video/target light and Marelux encrypted wireless triggering.
• Tradeoff: Three 18650 batteries are required (batteries are not included - we recommend the Marelux 18650 Battery), and photographers wanting TTL, HSS or wireless control must pay close attention to trigger compatibility rather than assuming every feature works automatically with every housing.

Quick Specs

Marelux Apollo III 3.0 Compatibility

The physical mounting side is straightforward: the Apollo III 3.0 can be integrated into a normal underwater camera tray-and-arm system. Trigger compatibility deserves more attention because manual firing, TTL, HSS, RC, PRE-M and MTL do not all use the same camera or trigger logic.

Why the Apollo III 3.0 Stands Out

Most powerful strobes make you choose between output and recycle speed. The Apollo III 3.0's strongest argument is that it gives you both: GN44 output with a 0.6-second full-power recycle, plus an MTL mode designed specifically for high-frame-rate shooting at reduced output.

That makes it especially interesting for fish behavior, schooling action, blackwater and other subjects where the best expression or body position may last only a fraction of a second. Compared with slower strobes, you spend less time waiting for the ready light and more time following the subject through the viewfinder.

Key Features in Real Underwater Use

20 fps MTL Mode for Fast Wildlife

A fast camera body is not much help if the strobes miss every second or third frame. Marelux's MTL mode is specified to fire at 20 fps at GN22 with a 0.05-second recycle time, making it one of the Apollo III 3.0's most useful features for behavior and rapid sequences.

• Better suited to fast fish and split-second behavior
• Lets modern mirrorless burst modes become more useful underwater
• Maintains more lighting continuity through a sequence
• GN22 output is the tradeoff for maximum burst speed

GN44 Power Across a 120° Beam

Wide-angle underwater photography needs more than a headline guide number. Coverage matters because a concentrated hotspot is much harder to place cleanly across a reef scene. The Apollo III 3.0 combines GN44 output with a 120° beam, a triple-tube design and a beaded dome lens intended to spread light more evenly across the frame.

• Strong choice for reefscapes and larger subjects
• Wide coverage reduces the need to aim a narrow beam precisely
• Useful when shooting fisheye and ultra-wide lenses
• Dual strobes remain the preferred setup for large, evenly lit scenes

3,000-Lumen Light and Better In-Water Controls

The built-in 3,000-lumen, 95 CRI, 5500K light can serve as a target light and handle shorter video clips without adding another small light to the rig. An LCD and dedicated controls also make it easier to confirm settings when conditions are dark or the dive is moving quickly.

• 3,000-lumen auxiliary video/target light
• 95 CRI and 5500K specification
• LCD provides visible operating information
• Dedicated controls reduce menu-driven adjustments underwater

Marelux Apollo III 3.0 vs. Other High-End Underwater Strobes

Guide number, watt-seconds and beam coverage are not standardized equally across every manufacturer, so headline power figures should not be treated as direct apples-to-apples measurements. The table below is most useful for comparing beam, recycle speed, triggering features and intended use.

Expert Verdict

Who should buy the Marelux Apollo III 2.1?

Buy the Marelux Apollo III 2.1 if you want one of the strongest still-photo underwater strobes with fast recycle time, broad coverage, and modern triggering options. It belongs on the shortlist for divers comparing the best underwater strobes for serious mirrorless and DSLR systems.

Choose a different strobe if you primarily shoot video and need a high-output continuous video light built into the same body, or if you want the smallest possible travel strobe. For advanced still photographers who want speed, power, and expandability, the Apollo III 2.1 is a very compelling Marelux strobe.

Why Buy Marelux from Bluewater Photo?

Marelux has developed a broad underwater imaging ecosystem that includes aluminum housings, ports, strobes, video lights, flash triggers and optical accessories. The Apollo III 3.0 continues that system approach with multiple trigger modes, replaceable batteries and a flash-tube design Marelux states has been endurance-tested to one million shots.

More importantly, Bluewater Photo can help with the part that product specification sheets rarely solve: matching the strobe to the exact camera, housing and trigger already in your rig.

Content reviewed by Bluewater Photo staff, 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.

Ready to build your lighting setup?

Expert support from underwater photographers.