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Message: <blockquote data-quote="singlerosa_RIP" data-source="post: 209469" data-attributes="member: 15556">Also, the sweet spot for most lenses is stopped down a bit from wide open.  So, if you have a 2.8 lens, your lens is at its best at f4-f5.6,  Stopping down further to f8 or above helps when you're shooting groups or landscapes.  A lens at 100mm, f4 at 10 ' has a DOF of 8".  Plenty of room to get all of a face in focus.  Shooting at 200mm and 2.8 at 20' gives you 6" DOF.  So even wide open you can get almost all of the person in a portrait in focus.  Once my lighting is set up, I might vary the aperture to adjust my lighting, just as I might change SS to modify ambient light.  Doesn't have as much to do with focus as it does with lighting.</blockquote>