well, i was going to say, get a morning reading and expose for the highlights (i know, i'm a rebel), with yer shutter speed at 1/250 or 1/500. after lunch, take another reading, again set yer exposure for highlights, 1/250 or 1/500. mid-afternoon, take yer third reading, 1/250 or 1/500; late afternoon, 1/125 -1/250.