markisclueless wrote in post #16065653
Hi, searched and found various threads on this topic but cannot find one solution that answers my question totally.
It revolves around AF point for birds about to take off.
I normally shoot in Shutter Priority mode with my ISO around 800 mark - AI Servo - Continuous shooting mode - Evaluative meetering - Spot Focus
I have spent about 1 year trying to capture a Rock Kestrel taking off and eventually mananged one this past weekend - the only thing is the Left wing is blurred whilst rest is crisp (focus was on the head). Shutter Speed was 1/2000 if I remember correctly.
Should I rather use ALL POINTS for AF in order to get the wing in focus or should I increase my shutter speed ?
Will post pic later today when at home
Using all AF points may not help as the focus only works at a two-dimensional plane (back to math, the XY plane). Adding depth by stopping down should get more depth (i.e., the z-axis) and allow more of the subject and the environment in focus. Also, activating all AF points can confuse the AF system if the environment is busy. The other issue with flight take off is that birds can flap their wings pretty fast during take off and you might need to crank up that shutterspeed hopefully to freeze the wings as much as possible.
To summarize, use single point and AI Servo, narrow your aperture (f/7.1 to f11), crank up the shutterspeed (which require raise your ISO to get the optimal exposure), and most important of all, shoot in good light!