Which of these six photos is sharpest?

[AgentDrex]

Sheesh...I was out on a really quick smoke break...five people missing from the office today...didn't really put the time into thinking out a better subject...I will find something different later...

 

[Stryker]

Get a ruler, lay it on a table, mount your camera on a tripod angled at 45 degrees, focus at a line beside the number using the middle point of your lens's focal length (at 50mm thereabout if your lens is 24-70mm), shoot with different aperture openings, crop to 100%, post them again. Then let's see which aperture opening is best for your lens.

 

[AgentDrex]

Thank you for thinking for me...now I feel like a complete dope...great idea though...and one I will try right away...thank you again Stryker....