Introduction to DNP Spherical Distortion Test Card

Used for testing geometric distortion and distortion indicators of cameras and lenses

Specification of DNP spherical distortion test card

The DNP spherical distortion test card has 158 double rings arranged in 14 rows and 17 columns. The vertical spacing is 1/14h, and the horizontal spacing is 2/25H.

The size of the double ring is as follows:

(1) Outer Ring

Radius of outer circle: 2/100h (2%)
Inner circle radius of the ring: 1.5/100h (1.5%)

(2) Inner circle

Radius of outer circle: 1/100h (1%)
Inner circle radius of the ring: 0.5/100h (0.5%)