Nikon's entry-level APS-C DSLR with 14.2MP sensor, HD video, and guide mode for complete beginners.
The Nikon D3100 was released in 2010 as Nikon's first DSLR to offer full 1080p video — at 24fps. 14.2MP APS-C DX CMOS sensor. 3fps burst. EN-EL14 battery (~550 shots). The camera was a significant milestone in Nikon's APS-C lineup for introducing HD video, though the 24fps-only 1080p implementation limited its video versatility. At approximately 455g body only.
14.2MP APS-C DX CMOS sensor. 11-point AF module. 3fps burst. 1080p video at 24fps only — the first Nikon DSLR with full HD. No weather sealing. EN-EL14 battery rated approximately 550 shots. Body weight approximately 455g without battery.
The D3100's 1080/24fps video was a landmark for the entry Nikon lineup: previous Nikon DSLRs (D3000) had no video. The 24fps-only limitation was a technical constraint of the first-generation Nikon DSLR video implementation — 30fps and 60fps came with later models. The EN-EL14 battery is carried forward across the D3100/D3200/D3300/D3400 series and the D5100/D5200.
On the used market the Nikon D3100 is very affordable as a vintage entry-level Nikon DX DSLR. Condition checks: shutter count via EXIF, EN-EL14 battery health (shared with D3100-D3400, D5100-D5200 series), and single SD slot. Video limited to 1080/24fps. Compatible with all Nikon F-mount DX and FX lenses (screwdrive AF requires in-body motor — D3100 has one).