Hi all, need advise. I'm thinking to buy zuiko 12-40mm f2.8 by selling all of my lenses including the 17mm f1.8 and add some money. What makes me doubt is, does the DoF between f2.8 and f1.8 were so different? Actually i like the character of 17mm and the bokeh is smooth. Do you have any samples comparable bokeh between them? Why i'm interested with 12-40? well i already tested it's amazing lens. You can do macro, landscape and portrait. I'm using EM5. I noticed that when i put this lens on EM5, the weight balance will more heavier on lens. That's why i consider to add vertical grip once i bought this. Need advise all. Thanks.