Canon's professional sports DSLR — the 1D Mark IV with 16MP APS-H sensor.
The Canon EOS-1D Mark IV is Canon's fourth-generation professional sports DSLR, introduced in 2009. It uses an APS-H (1.3x crop) CMOS sensor — larger than APS-C but smaller than full-frame — which was Canon's professional sports sensor format before transitioning to full-frame with the 1D X.
The 1D Mark IV provides a 16.1-megapixel APS-H CMOS sensor, 45-point AF system with 19 cross-type sensors, 10fps burst rate, ISO 100–12800 (expandable to 102400), Canon EF mount, dual DIGIC 4 processors, and a weather-sealed magnesium alloy body.
The 1D Mark IV was Canon's final APS-H format professional body — the 1D X (2012) moved to full-frame. The 1.3x crop provided a useful reach advantage for sports telephoto work while maintaining a larger sensor than APS-C. The 10fps rate and 45-point AF system were class-leading at launch.
Test the 45-point AF system across zone and tracking modes. Verify 10fps burst with a compatible fast card. Check weather seal integrity. Inspect shutter count against the rated 300,000-cycle lifespan. Test high-ISO performance at 6400 and 12800.