But we strongly support the Siemens Star, which provides information on angular MTF response and is the only pattern other than the slanted-edge that can reliably analyze MTF response above the Nyquist frequency.
For most purposes we recommend the slanted-edge, which provides accurate reliable measurements, runs fast, and can produce highly detailed maps of sharpness over the image surface. Sinusoidally-modulated stars are preferred, but bar (square wave-modulated) Siemens stars can also be analyzed for MTF, with appropriate normalization settings.Ī detailed comparison of Siemens Star and slanted-edge MTF results is presented in Slanted-edge versus Siemens Star – A comparison of sensitivity to signal processing. Star Chart, which can be run in the interactive Rescharts interface or as a fixed (batch-capable) module, measures SFR (Spatial Frequency Response) also known as MTF (Modulation Transfer Function) from Siemens star charts, which are included the ISO 12233:2014 standard.
Introduction – Creating, photographing, running – Output – MTF – MTFnn, MTFnnP
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