Nikon's 2016 entry ultracompact — 20MP CCD, 5x 26-130mm lens, 2.7in screen, 720p video, 119g.
The Nikon Coolpix A100 was an entry-level ultracompact introduced in January 2016 alongside the AA-powered Coolpix A10, forming the budget end of Nikon's late compact-camera range. It was one of the last of the very cheap CCD pocket cameras Nikon made before the lineup contracted around superzooms and waterproof models.
It carries a 20.1-megapixel 1/2.3-inch CCD sensor and a 5x zoom NIKKOR lens covering 26-130mm equivalent at f/3.2-6.5. The rear 2.7-inch fixed LCD handles framing, sensitivity runs from ISO 80 to 1600 (expandable to 3200), and video tops out at 720p HD at 30fps. There is no optical image stabilisation. It weighs just 119g ready to shoot, measures under 20mm thick, stores images on SD, SDHC or SDXC cards plus about 25MB internally, and uses the EN-EL19 lithium-ion battery rated for roughly 250 shots, charging in about an hour.
The A100 suits beginners and anyone wanting the smallest, simplest possible camera for daylight snapshots — it slips into any pocket and its Smart Portrait modes (skin softening, smile timer) do the thinking. The trade-offs are real: with no stabilisation and a slow lens at the long end, blur creeps in at full zoom or indoors, and the auto mode is reluctant to raise ISO, so it is happiest outdoors in good light.
Used examples are often nearly unused gifts, so cosmetics are usually good; the key checks are that the EN-EL19 battery (still widely available new, shared with many Nikon compacts) holds charge and the USB charging arrangement is included. Verify the lens extends without hesitation, the screen is unmarked, and test a few full-zoom shots for consistent focus. SDXC support means modern cards work fine.