Vivitar's budget waterproof 8.1MP compact — sealed to 10m, fixed f/2.8 lens, digital zoom, AA power, SD cards.
The Vivitar ViviCam 8400 was a budget waterproof compact of the late 2000s, sold in black, yellow and other finishes as an affordable underwater and beach camera under the Sakar-era Vivitar name. It was pitched at swimmers, snorkellers and holidaymakers who wanted a submersible digicam at a fraction of the price of the majors' rugged compacts.
It pairs an 8.1-megapixel sensor with a fixed 7.4mm f/2.8 lens and 8x digital zoom, in a housing rated waterproof to 10m (30ft). Framing is on a 2.4-inch LCD, video records at up to 640x480 at 25 frames per second, exposure compensation runs +/-2EV in half-stop steps, and there is a built-in flash. Storage is on SD cards, with sources citing 2-8GB as the practical maximum, and power comes from AA-size batteries.
As a used buy it appeals as a cheap poolside or beach camera where a phone or better compact should not go: the sealed body and AA power make it an easy grab-and-go. Image quality is basic snapshot fare, with digital-only zoom and a small sensor, so it suits holiday duty and kids rather than considered photography. The fixed wide lens works acceptably underwater at close range.
Waterproofing is the whole point, so inspect the battery and card door seals for perished or pinched rubber and any internal corrosion or fogging that betrays a past flood; treat untested seals as compromised and test submerged only with nothing to lose. Check the flash fires, the shutter and zoom buttons click positively through the sealed membranes, and that it writes reliably to a small SD card.