I think I have finally figured out a big problem I have been battling with. It appears my camera has a back focus error After attempting some shallow depth of field shots using a tripod I find my images are not focused where I had set the focus at. Instead a point behind it is in focus, so now on with the serious testing. If anyone else is having a similar problem here is an excellent site http://regex.info/blog/photo-tech/focus-chart
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