Image Circle Calculator
Find the minimum lens image circle required for any sensor size.
Enter the dimensions of the sensor in mm: (Usually found under specifications for any given camera)
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For a graphical representation of a lens image circle overlaid on a specific camera sensor, check out SENSORSIZES.COM created by cinematographer Jannik Tesch. Important note from his website...
...Image Circle vs Illumination Circle
The Image Circle of a given lens is defined as the area within which the manufacturer guarantees a defined optical quality performance.
The Illumination Circle or Circle of Illumination of a given lens is defined as the area within which there is still light, but of undefined quality. Vignetting, chromatic abberations, loss of sharpness, etc. may appear.
Image Circle and Illumination Circle are often used interchangeably, which can lead to confusion.