Method for determining an input phase and/or an input amplitude of an input light field (Ei), comprising the following steps: a) splitting the amplitude of the input light field (Ei) into a first light field and a second light field; b) propagating the first light field and the second light field in such a way that the first light field and the second light field traverse different geometric path lengths and identical optical path lengths and the propagated second light field is defocused relative to the propagated first light field; c) superposing the amplitudes and imaging the propagated first light field and the propagated second light field onto a detector in such a way that in each case a first spot (x11, x21, x31) of the propagated first light field and a second spot (x12, x22, x32) of the propagated second light field interfere on the detector to form a common output spot (x1, x2, x3) of an output light field (Ef), and the output light field (Ef) generates an interference pattern at the detector, wherein the respective first spot (x11, x21, x31) of the first light field (Ei) and the respective second spot (x12, x22, x32) of the second light field, which interfere to form a common output spot (x1, x2, x3) of the output light field (Ef), originate from the same input spot of the input light field (Ei), and wherein the output light field (Ef) has at least three output spots (x1, x2, x3), for which the following applies: (i) the output light field (Ef) is free from mutual coherence at different output spots of the at least three output spots (x1, x2, x3,...), and (ii) the output light field (Ef) exhibits at least partial spatial coherence within an output spot of the at least three output spots (x1, x2, x3,...); d) measuring at least a portion of the interference pattern by means of the detector, and determining a complex interference term from the measured interference pattern; and e) at least partially determining the input phase and/or the input amplitude from the complex interference term. a) splitting the amplitude of the input light field (Ei) into a first light field and a second light field; b) propagating the first light field and the second light field in such a way that the first light field and the second light field traverse different geometric path lengths and identical optical path lengths and the propagated second light field is defocused relative to the propagated first light field; c) superposing the amplitudes and imaging the propagated first light field and the propagated second light field onto a detector in such a way that in each case a first spot (x11, x21, x31) of the propagated first light field and a second spot (x12, x22, x32) of the propagated second light field interfere on the detector to form a common output spot (x1, x2, x3) of an output light field (Ef), and the output light field (Ef) generates an interference pattern at the detector, wherein the respective first spot (x11, x21, x31) of the first light field (Ei) and the respective second spot (x12, x22, x32) of the second light field, which interfere to form a common output spot (x1, x2, x3) of the output light field (Ef), originate from the same input spot of the input light field (Ei), and wherein the output light field (Ef) has at least three output spots (x1, x2, x3), for which the following applies: (i) the output light field (Ef) is free from mutual coherence at different output spots of the at least three output spots (x1, x2, x3,...), and (ii) the output light field (Ef) exhibits at least partial spatial coherence within an output spot of the at least three output spots (x1, x2, x3,...); wherein the respective first spot (x11, x21, x31) of the first light field (Ei) and the respective second spot (x12, x22, x32) of the second light field, which interfere to form a common output spot (x1, x2, x3) of the output light field (Ef), originate from the same input spot of the input light field (Ei), and wherein the output light field (Ef) has at least three output spots (x1, x2, x3), for which the following applies: (i) the output light field (Ef) is free from mutual coherence at different output spots of the at least three output spots (x1, x2, x3,...), and (ii) the output light field (Ef) exhibits at least partial spatial coherence within an output spot of the at least three output spots (x1, x2, x3,...); (i) the output light field (Ef) is free from mutual coherence at different output spots of the at least three output spots (x1, x2, x3,...), and (ii) the output light field (Ef) exhibits at least partial spatial coherence within an output spot of the at least three output spots (x1, x2, x3,...); d) measuring at least a portion of the interference pattern by means of the detector, and determining a complex interference term from the measured interference pattern; and e) at least partially determining the input phase and/or the input amplitude from the complex interference term.