I have a question concerning ctffind-4.1.10.
I'm using ctffind4 to analyze micrographs recorded with a phase plate.
But I get funny results:
1. I get negative phase shift although I limit the phase shift from 0 to 2.0
2. I get also phase shifts which are far beyond the borders I defined in the input file (phase shift 2.7 rad: input file limited to 2.0)
Is this a known behaviour for ctffind4 or am I doing something wrong?