i have EF-S18-55mm f/3.5-5.6 IS but is not able to give me better zoom and lower aperture setting to see the blur effects. i bought EF85mm f/1.8 USM recently but this is mainly for portrait and not wide enough...for newbies, what is a good lens to have and which shop can try those different lenses? i see mostly like no sample for us to test