The Canon 5D Mark II gives you excellent control over flash exposure, allowing you to adjust flash and ambient exposure independently of each other, in one-half or one-third EV increments.
A fairly powerful flash for its size, with uneven coverage at wide angle. Good exposures in our Indoor Portrait test shots. 24mm eq., f/2.0, ISO 200 120mm eq., f/3.9, ISO 200 Normal Flash, ISO 200 ...