I"m trying to take portraits and get the blurred background effect. I'm looking to buy a lens that is fast enough so I can blur the backgrounds. Will the 85mm 1.8 do the job? I'll be shooting up close like waist up or head and shoulders, but I'd also like to shoot full. Is there any other way to trick the camer to blur the background? I've tried photoshoping but it doesn't look as good as naturally blurred. I'm using a nikon D70. I don't have thousands of dollars to spend on a lens but is it worth the extra money to get a 1.4 instead of 1.8 lens?