I don't know how to start my topic here haha, well i try to shoot out a Christmas Tree inside Ngee Ann City. I take a shot of my girl friend using Sigma 30mm F/2.8 and SEL1855 using NEX-7. I tried the same shutter speed/ aperture, Range set to 30mm and 30+/-mm . but the background is blur.. i cant focus both my GF face and the Christmas tree.. is it because of the lens? or the setting? my GF is about 160cm tall and the tree is 3 level Tall... she stand like 30mm can see the whole body... while she is about 3-5m away from the Christmas tree.
Apologies for that i cannot describe it well