Nikons A1 MP multiphoton confocal microscope is a unique multiphoton imaging system featuring a high resolution galvanometer scanner. New 4 channel non-descanned detectors with higher sensitivity, reduced dark current and broad spectral range allow for real time unmixing of closely spaced probes for accurate and high-contrast spectral imaging. This is especially important in multiphoton microscopy because of the overlap of emission spectra of probes and autofluorescence, which is often unavoidable when using a single laser line.