Canon's flagship APS-H DSLR — 10.1MP with 45-point AF, 10fps, and dual DIGIC III processors.
The Canon EOS 1D Mark III was released in 2007 as the professional APS-H sports and news DSLR. 10.1MP APS-H CMOS sensor (28.1×18.7mm, 1.3× crop factor). No video recording — the 1D series did not gain video until the 1D Mark IV (2009). 9.9fps continuous shooting. LP-E4 battery. At approximately 1,155g.
10.1MP APS-H CMOS sensor (28.1×18.7mm, 1.3× crop). No video recording (1D Mark IV added 1080p). 9.9fps continuous shooting (marketed as ~10fps). 45-point AF system. LP-E4 battery. Approximately 1,155g body. Canon EF mount (APS-H sensor produces 1.3× crop with EF lenses). Dual CF card slots. Weather and dust sealing.
The 1D Mark III's 10.1MP at 9.9fps positioned it as the professional sports DSLR for press and sports photography: the APS-H sensor (larger than APS-C, smaller than full-frame) provided a 1.3× effective reach multiplier for telephoto lenses. The 1D Mark III was succeeded by the 1D Mark IV (2009, 16.1MP, 10fps, 1080p video) and eventually the full-frame 1D X (2012).
On the used market the Canon EOS 1D Mark III is very affordable as a vintage professional APS-H DSLR. Condition checks: LP-E4 battery health, shutter count (rated 300K actuations), dual CF card slot contacts. No video. APS-H 1.3× crop. Compatible with all Canon EF lenses.