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Message: <blockquote data-quote="Mike D90" data-source="post: 238423" data-attributes="member: 17556">Still working on this project; getting nice sharp images of flying birds.  While I don't think my bird shots to be horrible anymore I sure see room for lots of improvement.What I am struggling with now is getting foo sharp focus on the head/eyes of a flying bird.  I have taken my aperture down to f/8 as advised. Auto focus set to center point AFS continuous.Is it still my aperture giving me too shallow DOF?  How is DOF affected on a zoom lens as it is actually zoomed?  Is f/8 at 150mm the same as f/8 at 300mm zoom as to DOF?</blockquote>