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Articles on filmmaking technique, production planning, and industry knowledge.

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Tag: DoF Calculator
First AC pulling focus on a cinema lens with follow focus whip and measurement tape on a professional film set
Cinematography10 min read

DoF Calculator vs. Lens Markings: Which to Trust on Set?

Focus pullers explain when to trust a depth-of-field calculator and when to trust the marks on your lens barrel. Covers CoC mismatch, lens breathing, T-stop, and focus scale accuracy in 2026.

Depth of FieldFocusLens
Close-up of camera lens glass elements and aperture blades showing optical precision in a cinema prime
Cinematography13 min read

What Circle of Confusion Value Should You Actually Use? A Sensor-by-Sensor Guide

Most DoF calculators pick a default circle of confusion value and never show it to you. Some default to 0.029mm for every camera regardless of sensor size. Others use 0.025mm for 'cinema' modes that span three different sensor formats. Here is how to find out what your app is actually using and whether it is correct.

Circle of ConfusionDepth of FieldCamera