​@nzin

I adapted your code for ZOSPy (2.1.5) and tried it on the Double Gauss 28 degree field sample file.

import numpy as np
import zospy as zp

zos = zp.ZOS()
oss = zos.connect("extension")

newWin = oss.Analyses.New_FftMtf()

newWin_settings = newWin.GetSettings()
newWin_settings.MaximumFrequency = 12.3
newWin_settings.SampleSize = zp.constants.Analysis.SampleSizes.S_128x128

newWin.ApplyAndWaitForCompletion()

newWin_Results = newWin.GetResults()

data = newWin_Results.GetDataSeries(1)
xRaw = data.XData.Data
x = np.array(tuple(xRaw))
print(np.max(x))

I used a frequency of 12.3 to be extra sure it wasn’t a sort of default value.

The script output is (only printing maximum of x):

Maximum frequency: 12.3

I am using 2026 R1.

Perhaps you have a file to share with us that we can try with the script?

Take care,

David