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Lens Coverage Tool

Choose a Camera + Recording Format

Choose a Lens

Expand or Reduce Focal Length by

{{ selectedCamera.manufacturer }} {{ selectedCamera.model }}
Sensor: {{ roundFloatTwoDecimals(selectedCamera.sensor_width) }} x {{ roundFloatTwoDecimals(selectedCamera.sensor_height) }} mm
Recording Format: {{ roundFloatTwoDecimals(selectedRecordingFormat.recordingWidth)}} x {{roundFloatTwoDecimals(selectedRecordingFormat.recordingHeight)}} mm, Image circle: {{ roundFloatTwoDecimals(selectedRecordingFormat.recordingImagecircle) }} mm

{{ selectedSphericalPrimeLens.model }}
Image circle: {{ imagecircle==0 ? 'unknown' : imagecircle + ' mm' }}

{{ selectedSphericalZoomLens.model }}
Image circle: {{ imagecircle==0 ? 'unknown' : imagecircle + ' mm' }}

{{ selectedAnamorphicZoomLens.model }}
Image circle: {{ imagecircle==0 ? 'unknown' : imagecircle + ' mm' }}

{{ selectedAnamorphicPrimeLens.model }}
Image circle: {{ imagecircle==0 ? 'unknown' : imagecircle + ' mm' }}

{{ }}
{{ selectedFocalExpandersReducers.factor > 1 ? 'expands' : 'reduces' }} Lens Image circle to: {{ imagecircleAfterFocalLengthModification }} mm

MOBILE DEVICE: Graphical representation of lens coverage is disabled on smaller screens because an accurate overlay can't be displayed. Just check if the image circle of the lens is larger or equal to the image circle of the chosen recording format.


If the circle (lens) color is green you get sufficient corner-to-corner illumination on the sensor (blue rectangle) which should be aimed for for optimal picture.

Should the circle color turn orange the image circle of the lens does not (fully) cover the sensor and as a result you might see vignetting (darkening around the edges) or even portholing (blackness in the corners) may occur.

When using zoom lenses the image circle at the wider focal lengths is usually smaller than at longer focal lengths. Some lenses might cover the entire sensor at the long end but could introduce vignetting at the wide end.

Despite the theoretical data from this tool it is highly recommended to test your desired lens and camera combination before filming! PREP IS KEY