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Message: <blockquote data-quote="Fat Fingers" data-source="post: 565016" data-attributes="member: 41715">Oh some people do make a simple thing difficult.....take an expanding rule and pull it out about 4 ft ....lay it on the ground about 25ft away and put a pencil across it at say 24 in.  Stand back and photograph the pencil  at -20 through in 5s to +20 .I often use a flash to ensure no movement.examine the shots on your computer at 100%   You will soon see which is sharpest at 24 in.If you can tell no difference then either the lens combo quality is so bad its all blurred or  you need to stop down a little .( or you did not press OK  so did not take the shots at -20to +20</blockquote>