I see a lot of questions/complaints about lenses between 1.2 and 1.6 having focus issues. Many responses are "it is because of the DOF at that aperture" or something along those lines. To (hopefully) clarify how delicate it can be this for those new to this I have posted a crop showing DOF at 1.2. Look at the distance between the left eye (in focus) and the right eye. If either one of us had moved just a tiny bit the photo would have "focus issues". If you are new to wide apertures give yourself time to lean the lens. Don't get frustrated; these lenses must be tamed. I hope this post will help someone out there really understand shallow DOF with a wide aperture lens.
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20130606-184157_S9A0626-Edit.jpg by North Artworks, on Flickr