[font color=\'#000000\']As my Seagull opens to 3,5 I thought I should use its maximum aperture when shooting portraits or still lives but I was advised to use to expose at f8 or f11 to have a 'better picture'. Why is that? Why should I use that time for a photo where I don't need depth of field at all? What about those having very luminous lenses opening to 1:8, 1:7 etc? Should they use also the f8?