SeaLife ReefMaster RM-4K UW Camera

Name: SeaLife ReefMaster RM-4K UW Camera
Brand: SeaLife
SKU: SL350
Price: 349.00 USD
Availability: OutOfStock

SeaLife | SKU: SL350

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Product Information

The SeaLife ReefMaster RM-4K (SL350) is an ultra-compact underwater action camera built for divers and snorkelers who want 4K video and sharp stills without carrying a bulky rig. It pairs a 14MP Panasonic CMOS sensor with a 140° wide angle fisheye lens, records 4K video at 30fps or 1080p at 60fps, and the removable inner camera sits inside a robust housing rated to 130 ft / 40 m with a thumb-screw "Pressure-Lock" seal.

Who it is for

The RM-4K suits divers, snorkelers and travelers who want a pocket-sized camera they can operate one-handed, mount to a light tray, and pair with a Sea Dragon photo-video light for reef, wreck or macro scenes. The simple 4-button control system and fixed-focus lens make it a practical choice for divers who want straightforward point-and-shoot operation underwater rather than a full manual camera system.

Key details

Sensor and lens: 14MP Panasonic CMOS sensor with a 140° fisheye lens, 14mm 35mm-equivalent focal length, f/2.8 aperture.
Video and stills: 4K at 30fps, 1080p at 60fps, with electronic image stabilization and underwater color correction for deep and shallow conditions.
Waterproof rating: 130 ft / 40 m, sealed with a thumb-screw Pressure-Lock closing system.
Display: 2" color TFT LCD screen.
Memory: expandable with Micro SDHC/SDXC cards up to 128GB; Class V30 (U3) cards recommended for 4K recording.
Battery: removable 900 mAh / 3.8V Li-ion battery delivering 2+ hours of video or 500+ still images.
Weight: 7.1 oz / 202 grams for the housing with inner camera and battery installed.

Compatibility and sizing

The RM-4K is also offered as the RM-4K Pro 2000 Set (SL354), which bundles the same camera and housing with a Sea Dragon 2000F photo-video light. The housing mounts to a standard light tray and accepts SeaLife accessories including a spare battery (SL3504), screen shield (SL3506), Moisture Muncher drying capsules (SL911) to prevent internal fogging, and a Micro Wide Angle Dome Lens (SL052).

DiveCatalog.com is an authorized SeaLife dealer and a dive shop in Irvine, California since 2003. Call 888-701-4017 or chat with us if you have questions about fit, accessory compatibility or pairing the RM-4K with a Sea Dragon light.

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

Frequently Asked Questions

What memory card does the ReefMaster RM-4K need?

The RM-4K uses Micro SDHC/SDXC cards up to 128GB, sold separately. SeaLife recommends a card rated Video Speed Class V30 or UHS Speed Class U3 to handle the data rate of 4K recording without dropped frames.

What is the difference between the RM-4K and the RM-4K Pro 2000 Set?

The base RM-4K (SL350) is the camera and underwater housing only. The RM-4K Pro 2000 Set (SL354) includes the identical camera and housing bundled with a Sea Dragon 2000F photo-video light, so you have a complete lighting kit out of the box.

Can the RM-4K be used with Sea Dragon lights other than the 2000F?

Yes. The housing mounts to a standard light tray and is designed to pair with Sea Dragon constant LED photo-video lights, not just the 2000F included in the Pro 2000 Set. There is no flash or external strobe sync; you simply turn the light on and adjust intensity.

How long does the RM-4K battery last?

The removable 900 mAh, 3.8V Li-ion battery provides 2+ hours of video recording or captures 500+ still images on a charge. A spare battery (SL3504) is available as an accessory for extending dive days without recharging.

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Sensor	14MP Panasonic CMOS
Lens / Field of View	140° Wide Angle Fisheye, 14mm (35mm equivalent focal length)
Aperture	f/2.8
Focus type	Instant fixed-focus lens, 12 in to infinity (30 cm to infinity)
Shutter response	0.30 seconds
Shutter speed	1/25 to 1/2000 second
ISO	Auto, 100 to 3200
Video	4K @ 30fps, 1080p @ 60fps
Shooting modes	Single, Burst (3, 7, 15, or 30 photos), Time Lapse Photo, Time Lapse Video
White balance	Auto, Underwater Shallow, Underwater Deep, Daylight, Cloudy, Tungsten, Fluorescent
LCD	2.0" color TFT LCD, 230K resolution
Memory	Micro SDHC/SDXC up to 128GB (sold separately), V30 (U3) recommended for 4K
Battery	Removable Li-ion, 900 mAh / 3.8V / 3.42Wh
Battery life	2+ hours video / 500+ still images
Waterproof depth	130 ft / 40 m
Shockproof	3 ft / 1 m
Tripod mount	Standard 1/4-20 threads
Weight	7.1 oz / 202 grams (housing with inner camera and battery)
Dimensions (housing)	1.9" x 4.1" x 2.6" (4.9cm x 10.5cm x 2.6cm)
WiFi app	Free ReefMaster app (Google Play and Apple App Store)