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For about $75 you can pick up this wonderful lens from B&H or from many other camera vendors. It is considered an absolute necessity for the photographer's bag, because of it's very low price and incredible performance.
The Depth of Field (DOF) at f/1.8 is very, very narrow when shooting at the close focus distance, but can be very pleasing for things at a longer distance (3m+) where light is scarce. Stopped down by a few stops, the lens performs excellently. The image is sharp throughout most of the image.
The AF may not be as accurate/fast as on this lens as on the f/1.4 version because of the lack of USM for the focus motor. Because the great amount of light (f/1.8) that is being let in at any given time during AF operation, the AF is still pretty fast.
•Extremely sharp when stopped down a bit
•AF is not constantly overridable because of DC focus motor
Bottom line: Own this lens. If you're more of an enthusiast/professional who needs the USM and extra light, spring for the f/1.4 version.