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Message: <blockquote data-quote="peteh" data-source="post: 1862334" data-attributes="member: 826">Richard,  on your shot it looks like the camera is back/front focusing to me.  First step is to do the lens micro adjustment.  I am amazed at the amount of people who dont use this.  Its absolutely vital.  In the old days we used to send our bodies and lens to canon straight off to get them adjusted nowadays the adjustment option is all built in and a superb feature.Google "focus test chart" and print one out.   You then place that at a 45 degrees angle and focus on the middle.  You can then check which way your focus is out, then adjust the microadjustment and keep shooting till its bang on.At the moment I have my 7d, 500 combo at -10... my 7d, 500, 1.4tc combo at -3.my 1dmk3, 500 combo at -15.  etc etc.Leaving them at unadjusted would have every shot not as sharp as it should be.I am sure the difference between your mk3 and 7d is that the 7d with the lens combo needs an adjustment whereas you were lucky with your mk3 in that it didnt.</blockquote>