Getting both eyes in focus
I was just wondering how you get both eyes in focus when you're shooting wide open. My camera only focuses on one eye, making the other blurred.
And how do you make the eyes so crisp?
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one of the principles of lens and depth of field is the hyperfocal distance. This term means that to maximize the depth of field at any focal length,, a point that is 1/3 in front and 2/3 behind the point of focus will maximize the depth of field. Additoinally, the shorter the focal length the greater the depth of field. the next factor is the distance from the focal plane to tthe subject. the shorter the distance, the shallower the depth of field8 July 2012
zamilphotos wrote:This problem is something i see in prime lens and not in zoom lenses like 70-200 or 24-70mm. I may be wrong.
I think you're wrong, it has to do with what the distance is between the camera and the object you want to shoot ..
If you 200mm (f2, 8) shoots at an object which is 5 feet away from you, then you will have less depth of field than with 10 meters
So it does not matter if you have a 50mm prime or you put your 24-70mm at 50mm, the result will be the same when using the same aperture
This is something I see happen often with lens with very wide apertures (f< 2.8) of the 50mm prime.. the trick i use is keep the aperture at f 4 and keep increasing the aperture up to and including f 2.8. Like the rest, keep the eyes in the same plane. If you can pin point a focal point, choose one right over the eye furthest from the lens. This problem is something i see in prime lens and not in zoom lenses like 70-200 or 24-70mm. I may be wrong.18 February 2012
Those example images you link to are rescaled to such a low res that the DOF is actually much bigger than when viewed big.16 February 2012
Also DOF calculators are actually useless other than as a rough guide on the basis that it depends what you consider to be sharp ... images don't suddenly become sharp and then go out of sharpness at the distances they suggest, it's gradual throughout depth of subject.
I agree with Mirhan & Fred, wide open for a head shot, the DOF will be very shallow ... unless the eyes are in same plane you will need to focus between the eyes and accept imperfect sharpness on outside edges of both eyes, or stop your lens down or with a very still model you could try focus stacking.
With your lens wide open you will need to ensure that the eyes Both of the same distance from your camera...by the shallow depth at different distances will very soon 1 eye no longer in focus ...14 February 2012
You can calculate the depth of field of almost every camera.