Three Focusing Points Look through the viewfinder of the EOS 50 and you will see the three small frames across the center of the screen. These are the focusing points. The camera focuses on the subject covered by the active focusing point. The active AF point can also be selected manually on the camera by pressing the focusing point selector button and turning the main dial. AIM - The Canon System which brings it all Together The Canon metering and focusing systems are remarkable by themselves. But bring them together and the sum is greater than the parts. Canon calls it 'AIM' (Advanced Integrated Multipoint) control. The principle is simple: the metering follows the focusing so that the main subject is always shot with the correct exposure. If the subject is to the left of the frame, that is where the meter reading will be taken. Flash metering is linked to the system too, giving optimum exposure indoors and outdoors. 6-zone Evaluative metering Evaluative metering creates professional expertise in your camera. Meter readings are taken from six different areas of the scene. A built-in computer then compares these readings with a library of typical scenes. In this way, the EOS 50 is able to detect light or dark backgrounds as well as other difficult lighting situations and it also adjusts the exposure accordingly. In reality, this is easier said than done. Most users failed to realize that to ensure correct exposure with the EOS 50, they must make sure that one of the three AF points has to lock onto the main subject or otherwise the camera will give an incorrect reading. This scene was recorded accurately No problem with this as well Slight backlit phone booths against mural flag AF points all locked onto the SAS Clock Tower to ensure correct exposure << Back to Main . 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 .