Imaging apparatus for imaging an object under investigation, in particular a biological object, comprising: - a light source device arranged for an illumination of the object, - a light detector device arranged for detection of light emitted by the object in response to the illumination of the object, - an acoustic detector device arranged for collecting broadband acoustic signals generated in the object in response to the illumination of the object, and - an image reconstruction device arranged for reconstructing an optical image and an opto-acoustic image of the object, characterized by a resolution adaptation device configured for adjusting the spatial resolution and the imaging depth of the opto-acoustic image, wherein - the resolution adaptation device includes a filtering unit arranged for subjecting the collected acoustic signals to at least one frequency filtering selected in dependency of the desired imaging depth to be obtained, and the resolution adaptation device is configured for adjusting the spatial resolution to the desired imaging depth by the frequency filtering by the filtering unit, wherein the resolution varies with the imaging depth, and - the image reconstruction device is arranged for reconstructing images of different segments (1.1, 1.2) of the object, wherein the optical image is obtained from a first segment (1.1) of the object and the opto-acoustic image is obtained from at least one second segment (1.2) of the object, the first segment (1.1) being a superficial segment of the object which is located at the surface or near the surface of the object and the at least one second segment (1.2) being a volume segment which extends within the object at a finite distance from the surface of the object, wherein the opto-acoustic image from the at least one second segment (1.2) adjoins the optical image from the superficial segment of the object. - a light source device arranged for an illumination of the object, - a light detector device arranged for detection of light emitted by the object in response to the illumination of the object, - an acoustic detector device arranged for collecting broadband acoustic signals generated in the object in response to the illumination of the object, and - an image reconstruction device arranged for reconstructing an optical image and an opto-acoustic image of the object, - the resolution adaptation device includes a filtering unit arranged for subjecting the collected acoustic signals to at least one frequency filtering selected in dependency of the desired imaging depth to be obtained, and the resolution adaptation device is configured for adjusting the spatial resolution to the desired imaging depth by the frequency filtering by the filtering unit, wherein the resolution varies with the imaging depth, and - the image reconstruction device is arranged for reconstructing images of different segments (1.1, 1.2) of the object, wherein the optical image is obtained from a first segment (1.1) of the object and the opto-acoustic image is obtained from at least one second segment (1.2) of the object, the first segment (1.1) being a superficial segment of the object which is located at the surface or near the surface of the object and the at least one second segment (1.2) being a volume segment which extends within the object at a finite distance from the surface of the object, wherein the opto-acoustic image from the at least one second segment (1.2) adjoins the optical image from the superficial segment of the object.