Pascale, you could also use the exposure memory here - kinda zoom to the part you want to have exposed correctly check the settings with half pressing the shooting button then press the * button (exposure memory) change back to the crop you want to have and go... (i hope you know what i mean now - don't know the correct eglish wordings here) but you have to be a bit fast as the exposure memory just resides for 20 seconds or something like that... otherwise just do the same thing and remember the values shown when checking the right lighting... my five cent