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Old 03-12-2006, 07:06 AM   #16
SDK2003
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Join Date: Jun 2003
Location: Solihull - UK
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Depth of field at a focal length of 200mm, F4.5 with a subject distance of 30 meters is 3.8 meters.
If you focus on the nearest point the you are losing 1/3 focus towards the back.

Remember also that focus works a single plane so you need to take that into account as well.
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