Over the past decade, the world of cinema optics has opened up. Lens manufacturers, responding to the growing demand for flexibility, have embraced modularity—giving end-users the option to swap mounts, service mechanical components, and yes, even adjust their own back focus. This accessibility is a win for the working cinematographer, but with it comes a flood of assumptions and, frankly, some dangerous misinformation. Grab a cup of coffee and read on for a more in-depth understanding of this commonly misrepresented feature.
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