Wide aperture - Pictures out of focus

Started Aug 3, 2014 | Discussions thread
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DOF too narrow........
In reply to Jizzy, Aug 3, 2014

Jizzy wrote:


Most of my pictures are out of focus when I shoot with a wide aperture with my 85mm 1.8 on a 70d.

I focused on the eye with single point AF.
Did I move too much? Or does the lens have front-/backfocus?

f1.8 1/2000 iso 100

thx for your help

this is one of the problems with larger sensored cameras. Wide open the DOF is just too shallow to do portrait work. I am going to assume that you were about 8 feet away from the subject. That camera at that distance with that lens at f/1.8 has a DOF of about 2 inches. Not nearly enough to get the subject's whole head from front to back in focus; you need at least 8-10 inches for that.

So, stop down to about  f/8 and you will get a DOF of about 8-10 inches.

Now, you have to ask yourself why did you spend so much money for a f/1.8 lens when you really can't use it wide open for the types of photo's you want to shoot!


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