When my 16-month-old daughter sits or stands still and stares at the Canon 5D Mkii camera (this happens about once a month), getting her eyes sharp is easy. Check.
However, the other 99% of the time, she's moving all over the place, as toddlers do. I need some help with getting her eyes in focus.
First of all, here's what I now do:
- I try to light the area (either naturally or artifically) as much as possible .... however, toddlers turn toward and away from the sun, run from the well-lit room to the darker hallway, etc. She rarely shows any interest in staying in the photographically optimum place. Go figure. Remember, this is NOT a newborn sitting idly on a comforter-covered beanbag, surrounded by softboxes. This is a tiny bundle of go.
- I try to shoot with the lens wide open or at least near wide open .....I want the nice bokeh, but the small f number (wide aperture) of course produces such a narrow depth of field (DOF) that any movement of hers toward/away from the camera will push the limits of that small DOF.
- I generally try to keep the ISO at low as possible, but of course in conjunction with wide aperture I need to bump the ISO in order achieve a sufficiently fast shutter speed.
- I try to use AI Servo focus mode, but herein lies the challenge. I try to set the focus point (usually center one) on her eyes or at least as close to the eyes as possible. However she is all about non-stop movement, so because I don't have a missile-tracking software alorithm embedded in my brain, there's no way I can keep the focus point locked on her eyes. Heck, I have trouble keeping it tracked on her head. This girl can move.
- I've experimented with back-button focusing, and yes it's cool. But the main problem is tracking her eyes (or face at least) with the selected focus point.
So a few days ago I took her aside, sat her down, and said in words any 16-month-old can understand, "Honey, when daddy tries to take your picture I need you to stand still and stare at the camera. When I shoot with a wide aperture I have precious little DOF to play with. If you insist on moving, I need you to move side to side so that you stay in the same focal plane. But if you move toward me with your head bouncing all around, daddy can't keep your eyes in focus, and as we all know, gettting sharp eyes is the key to a great picture." Then I started explaining the calculations of DOF at different apertures, and also how ISO, aperture, and shutter speed contribute to a proper exposure. At this point, she replied "splib", drooled on my foot, and ran away giggling. The giggling is what hurt the most.
At this point, I'm ready to shoot in AI Servo, aim for center mass (meaning her torso), and begin to spray-n-pray and hope for the best. The point of trying for the torso is that it's bigger than the eye area and thus easier to track, and also the tummy/chest area is almost in the same focal plane as the eyes.
Any help will be appreciated.








