Electric circuit for a microscope , the electric circuit comprising a lock-in amplifier , wherein the lock-in amplifier comprises an input for an input signal (s), an input for a reference signal (r), an output for an output signal , and a bandwidth filter device , wherein the bandwidth filter device is adapted such that a low bandwidth frequency value and/or a high bandwidth frequency value is variably settable, wherein the electric circuit comprises a dynamic bandwidth controller unit into which parameters (P) of a current setting of the microscope are input, wherein the dynamic bandwidth controller unit is adapted to control the low bandwidth frequency value and/or the high bandwidth frequency value of the lock-in amplifier as a function of the parameters (P) of a current setting of the microscope , wherein the dynamic bandwidth controller unit is adapted to control the low bandwidth frequency value and/or the high bandwidth frequency value of the lock-in amplifier depending on a potential highest temporal frequency in a demodulated signal, wherein the potential highest temporal frequency in the demodulated signal is calculated by the formula f High = F Sys ⋅ f scan ⋅ NA MO 1.22 λ ⋅ Zoom ⋅ M MO ⋅ fill with: a wavelength λ of light being focused onto an object, a numerical aperture NA MO of a microscope objective, a system dependent length F sys which depends on a magnification of the microscope optics, a magnification M MO of the microscope objective, a value Zoom representing an additional magnification of a beam path of the microscope, a duty cycle fill of the laser scan, a scan frequency f scan . the lock-in amplifier comprises an input for an input signal (s), an input for a reference signal (r), an output for an output signal , and a bandwidth filter device , an input for an input signal (s), an input for a reference signal (r), an output for an output signal , and a bandwidth filter device , wherein the bandwidth filter device is adapted such that a low bandwidth frequency value and/or a high bandwidth frequency value is variably settable, wherein the electric circuit comprises a dynamic bandwidth controller unit into which parameters (P) of a current setting of the microscope are input, wherein the dynamic bandwidth controller unit is adapted to control the low bandwidth frequency value and/or the high bandwidth frequency value of the lock-in amplifier as a function of the parameters (P) of a current setting of the microscope , wherein the dynamic bandwidth controller unit is adapted to control the low bandwidth frequency value and/or the high bandwidth frequency value of the lock-in amplifier depending on a potential highest temporal frequency in a demodulated signal, wherein the potential highest temporal frequency in the demodulated signal is calculated by the formula f High = F Sys ⋅ f scan ⋅ NA MO 1.22 λ ⋅ Zoom ⋅ M MO ⋅ fill with: a wavelength λ of light being focused onto an object, a numerical aperture NA MO of a microscope objective, a system dependent length F sys which depends on a magnification of the microscope optics, a magnification M MO of the microscope objective, a value Zoom representing an additional magnification of a beam path of the microscope, a duty cycle fill of the laser scan, a scan frequency f scan . a wavelength λ of light being focused onto an object, a numerical aperture NA MO of a microscope objective, a system dependent length F sys which depends on a magnification of the microscope optics, a magnification M MO of the microscope objective, a value Zoom representing an additional magnification of a beam path of the microscope, a duty cycle fill of the laser scan, a scan frequency f scan . <EOS>