Currently, cameras based on CCD and CMOS detector matrices offer excellent features in imaging systems if they are appropriately designed. Therefore, to investigate the suitability of the use of one or the other technology according to the specific application of the camera, the complete characterization of the different types of detectors becomes necessary.In this work, we have analysed the quality of the images provided by different cameras by the speckle method. For this, we have comparatively studied the Modulation Transfer Function (MTF) at different wavelengths of the visible spectrum, for the detectors of a low-cost CCD video camera and of two scientific cameras (a CCD and a CMOS).For the CCD detector of the video camera, the highest value of the MTF was reached at the lowest of the wavelengths studied. Furthermore, the differences between the MTF curves corresponding to the different wavelengths analysed become more notable as the spatial frequency increases.In the case of scientific cameras, the behaviour of the MTF with wavelength does not present the same trend as that observed for the low-cost video camera. For each of the three wavelengths studied, the CCD detector presented MTF values higher than those of the CMOS detector.