From the course: Learning Cinematography: 3 Hands On Techniques
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Focus splits and zone of focus
From the course: Learning Cinematography: 3 Hands On Techniques
Focus splits and zone of focus
- Focus is an ethereal thing. It's not a physical substance that you can put your finger on. It doesn't disappear all of a sudden. It gradually deteriorates as you move away from the critical point of focus. Now, you have to find it in order to use it. First, let's define the term Zone of Focus. There are actually two zones of focus. The Zone of Focus is the area in front of and behind the lens which is acceptably sharp. Briefly, the area behind the lens is a concern because it's a technical adjustment, best left to trained technicians. This is also one of the factors we consider when we're picking a camera in the first place. How stable is the zone of focus, sometimes called collimation or back focus. Now I don't want to get into too much depth. Suffice it to say that part of the testing is determining that the zone of focus places the image at the plane of the sensor and that it stays there. Now, in front of the lens, we have what I'll call the subject zone of focus. So let's take a…
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