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Message: <blockquote data-quote="Fred Kingston_RIP" data-source="post: 695189" data-attributes="member: 10742">What you want to calculate for is called Hyperfocal Distance... That's the distance in focus in front of your lens to infinity when the lens is set to infinity... <a href="http://www.dofmaster.com/dofjs.html" target="_blank">Online Depth of Field Calculator</a>Here's a calculator... Plug in all your camera/lens specifics, and it'll tell you what aperture to use to get where you want to be... by swapping the lens data for the Sigma, you can determine whether the Sigma will give you more range for the cost, or whether your current lens (by closing the aperture) will give you what you want...</blockquote>