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the 50mm 1.8 is a huge step up in terms of image quality over the 18-55. it is however very cheaply made, but for £90 new its not a huge concern. The big advantage of this lens is that its openable up to 1.8, however it is slightly soft here, stop down to 2.2 and the images are much better.
As a second lens its perfect. On a crop sensor it wouldn't seem right as an only lens as it seems zoomed in, to about 80mm which is perfect for portraits, but cumbersome for everyday shooting.
In canons auto mode you cant change the focus point, you could try shooting in P mode. P mode the camera selects the shutter speed and aperture, however you can change these together using the scroll wheel. P mode also allows for the iso and the focus point to be changed. this could help your problem.
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