Depth of field: Blackmagic Pocket Cinema 4K
The Blackmagic Pocket Cinema 4K uses a Micro Four Thirds 4K sensor at 18.96 × 10 mm — which fixes the circle of confusion at 0.019 mm, and from that every depth-of-field number on this page. Example: 50 mm at T2.8 focused at 2 m gives 0.17 m of usable depth (1.92 m to 2.09 m). The calculator above is preset to the Blackmagic Pocket Cinema 4K.
Depth of Field Calculator
- Near limit
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- Far limit
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- Total depth
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- Hyperfocal
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- FoV / frame width
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Circle of confusion per camera derives from sensor width (d/1000 convention). Camera list: nominal manufacturer specs.
Hyperfocal distance on the Blackmagic Pocket Cinema 4K
Focused at the hyperfocal distance, sharpness runs from half that distance to infinity — the one number that matters for landscapes, establishers and any shot without a focus puller.
| Focal length | T1.4 | T2 | T2.8 | T4 | T5.6 |
|---|---|---|---|---|---|
| 18 mm | 12.2 | 8.5 | 6.1 | 4.3 | 3.1 |
| 25 mm | 23.5 | 16.5 | 11.8 | 8.2 | 5.9 |
| 35 mm | 46.1 | 32.3 | 23.1 | 16.2 | 11.5 |
| 50 mm | 94.0 | 65.8 | 47.0 | 32.9 | 23.5 |
| 85 mm | 271.7 | 190.2 | 135.9 | 95.2 | 68.0 |
Depth of field at interview distance (2 m)
The interview question in numbers: how much room does the subject have in front of the Blackmagic Pocket Cinema 4K before drifting out of focus?
| Focal length | T1.4 | T2 | T2.8 | T4 | T5.6 |
|---|---|---|---|---|---|
| 35 mm | 0.17 m | 0.24 m | 0.34 m | 0.49 m | 0.70 m |
| 50 mm | 0.08 m | 0.12 m | 0.17 m | 0.24 m | 0.33 m |
| 85 mm | 0.03 m | 0.04 m | 0.06 m | 0.08 m | 0.11 m |
Working with it on set
Recording at 4096 × 2160, large-screen 4K delivery judges focus more harshly than the table: for critical work, halve the circle of confusion mentally — the 0.17 m at 50 mm/T2.8/2 m becomes half that. The table follows the classical cinema convention.
In pre-production the number belongs in the shot list: a shot planned at T1.4 on 85 mm needs a focus puller and time — both of which belong in the schedule before they are missing on set.
Frequently asked
What circle of confusion does the Blackmagic Pocket Cinema 4K use?
0.019 mm — following the usual sensor-width ÷ 1000 convention (18.96 mm ÷ 1000, rounded). Every table on this page uses it.
Do the numbers hold for any lens?
Yes — depth of field depends on focal length, stop, distance and sensor, not the lens model. What differs between lenses is bokeh (how the blur looks), not where it starts.