What is the depth of field at 85mm f/1.4 on full frame?
At 85mm, f/1.4, on full frame, focused at 3 meters — a typical head-and-shoulders portrait distance — total depth of field is roughly 9.8cm, running from about 2.95m to 3.05m from the camera. That's a genuinely thin sharp plane: barely enough to keep both eyes in focus if a subject's face is angled even slightly away from the camera.
Why This Is So Thin
85mm's classic portrait compression comes paired with a real cost at f/1.4 and typical portrait distances: the near and far limits sit almost exactly the same distance apart regardless of which side of the focus point you measure, and at this focal length and aperture that gap collapses to well under 10cm. This is exactly why portrait photographers shooting wide open are taught to focus precisely on the near eye — the far eye, the ear, even a tilted nose can fall outside this narrow band.
What Changes This Number
Stopping down to f/2.8 roughly doubles the total depth of field at the same distance (to close to 20cm), a real, useful adjustment for a group portrait or a moving subject where more margin for focus error matters more than maximum background blur. Moving the subject further away also widens the sharp zone — depth of field always increases with subject distance, at any aperture.
Confirm this for your own working distance and aperture in the DoF & Hyperfocal Calculator, pre-filled with 85mm f/1.4 at 3 meters.
Frequently Asked Questions
Why do photographers say to focus on the near eye at 85mm f/1.4?
Because total depth of field at typical portrait distances is often under 10cm — genuinely too thin to guarantee both eyes stay sharp if the face is angled, so focus is placed deliberately on whichever eye is closest to the camera and therefore the most likely to draw a viewer's attention first.
Does depth of field at 85mm f/1.4 change much between a headshot and a full-body portrait?
Yes, substantially — depth of field widens as subject distance increases, so a full-body portrait shot from several meters back has a meaningfully deeper sharp zone than a tight headshot at 3 meters, even at the identical aperture.