SeaLife

SeaLife ReefMaster RM-4K

Budget dedicated dive camera waterproof to 40m without a housing, well past recreational no-decompression limits on its own.

Dive-ready without housing

Rated waterproof to 40m on its own. No separate housing required for recreational depths within that rating.

SeaLife ReefMaster RM-4K
2.9Comparison Score
$349
Buy on Amazon
Released2018
Typeunderwater compact
Resolution14 MP
Max video4K30
Sensor size1/2.3"
Native waterproof40m
StabilizationNo
RAW supportNo
Housing depth rating—
Housing material—
Weight219g
Pros
  • 40m native rating covers essentially every recreational no-decompression dive with no housing purchase required
  • Priced well below the TG-7 and Micro 3.0 while still beating both on native depth rating
  • Compatible with SeaLife's wide-angle and macro add-on lenses and its Sea Dragon light/strobe mounting system, letting you build up a photo rig later without replacing the camera
Cons
  • No RAW support and no image stabilization, same limitation as the rest of SeaLife's non-Micro lineup
  • 2018-era camera; sensor and processing are dated next to the more recent TG-7 or an action cam
  • Removable-door, O-ring-sealed design (unlike the Micro 3.0's fully sealed body) means standard maintenance and seal-checking before every dive

The SeaLife ReefMaster RM-4K is a budget-tier dedicated dive camera that undercuts the TG-7 and Micro 3.0 on price while still reaching 40m of native waterproofing with no housing, which is deeper than most recreational divers will ever go. It shoots 14MP photos and 4K video with no RAW or stabilization, reflecting its position as an accessible entry point into dive photography rather than a top-tier imaging tool. It uses a conventional removable battery-door design sealed by O-rings, so unlike the Micro 3.0 it needs the usual pre-dive seal check, but it’s also compatible with SeaLife’s add-on lens and lighting system if you want to grow the kit later.