1. Turn off auto mode. 2.

1. Turn off auto mode.

2. Set ISO Speed manually – READ THIS -> http://terragalleria.com/blog/2011/03/22/best-iso-for-low-noise-on-canon-5d-mk2/

3. ISO settings on the 5Dmk2 does matter just as it does on 50D, 60D, 7D. As pointed out by Vincent LaForet you should shoot at multiples of ISO 160 on these camera for the lowest noise.

4. 2.8 f/stop or less(1.x) a must.