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SENSOR Effective pixels: 21 megapixels
SENSOR Max resolution: 5616 x 3744
SENSOR Sensor size: Full frame (36 x 24 mm)
SENSOR Sensor photo detectors: 22 megapixels
IMAGE ISO: Auto, 100 - 6400 in 1/3 stops, plus 50, 12800, 25600 as option
IMAGE Boosted ISO (maximum): 25600
SCREEN / VIEWFINDER Articulated LCD: Fixed
SCREEN / VIEWFINDER Screen dots: 920,000
VIDEOGRAPHY FEATURES Microphone: Mono
PHYSICAL Weight (inc. batteries): 850 g (1.87 lb / 29.98 oz)
CONNECTIVITY HDMI: Yes (HDMI mini)
Main
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PHOTOGRAPHY FEATURES Continuous drive: 10.0 fps
OPTICS & FOCUS Number of focus points: 19
Summary
The Canon EOS 5D Mark II maximum resolution of 5616 x 3744 pixels (21 megapixels) is better than the Canon EOS-1D Mark III maximum resolution of 3888 x 2592 pixels (10 megapixels). The Canon EOS 5D Mark II has bigger sensor than the Canon EOS-1D Mark III: Full frame (36 x 24 mm) versus APS-H (28.7 x 18.7 mm). This is the most important specification of this model as big sensor lets the camera owner to make pictures of the more professional quality. The Canon EOS 5D Mark II has a wider ISO range of 100-6400 in compare with 100-3200 ISO range of the Canon EOS-1D Mark III. This ISO numbers let you to make better pictures in low light situations. The Canon EOS-1D Mark III offers more focus points in compare with the Canon EOS 5D Mark II: 19 vs 9. More focus points means less risk of losing focus lock while following a moving object.
The EOS 5D Mark II is produced with tilting LCD which will let the camera owner to take photos from any odd angle. The Canon EOS 5D Mark II screen is better as it offers more screen dots 920,000 in comparison to 230,000 dots of the Canon EOS-1D Mark III screen. The higher dot count screen is better for reviewing images on your camera.
The EOS 5D Mark II weighs 850g which is 485g less than the weight of the EOS-1D Mark III.
Taking into account the above differences the Canon EOS 5D Mark II will be the best choice. Get the lowest price on Amazon