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<blockquote data-quote="wornish" data-source="post: 326423" data-attributes="member: 15434">The missing piece of the third part of this diagram is the person will take up a different percentage of the viewed image.focussing on a person at 10m with a 28mm lens will show the the whole person and a lot of the surrounding area.&nbsp; Do the same thing zoomed in at 200mm and all you will see is the head.&nbsp; Both shots will be in focus on the head and if you crop the head out of the 28mm shot you will see no difference in the focus compared to the 200mm shot.To add even more complexity the size of the sensor also has an impact. There are some DOF charts you can download here that covers most of the standard lens sizes.&nbsp; Just select your camera from the drop down and the lens.<a href="http://www.dofmaster.com/doftable.html" target="_blank">Depth of Field Table</a>This stuff can drive you crazy so I just take pictures and stick to using the simple rules of smaller aperture gives more DOF and focus about 1/3 of way in for landscape shots.</blockquote>

[QUOTE="wornish, post: 326423, member: 15434"] The missing piece of the third part of this diagram is the person will take up a different percentage of the viewed image. focussing on a person at 10m with a 28mm lens will show the the whole person and a lot of the surrounding area. Do the same thing zoomed in at 200mm and all you will see is the head. Both shots will be in focus on the head and if you crop the head out of the 28mm shot you will see no difference in the focus compared to the 200mm shot. To add even more complexity the size of the sensor also has an impact. There are some DOF charts you can download here that covers most of the standard lens sizes. Just select your camera from the drop down and the lens. [url=http://www.dofmaster.com/doftable.html]Depth of Field Table[/url] This stuff can drive you crazy so I just take pictures and stick to using the simple rules of smaller aperture gives more DOF and focus about 1/3 of way in for landscape shots. [/QUOTE]

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