A string formatted version of EXIF_ExposureTime.
E.g. if EXIF_ExposureTime is 4 then EXIF_ExposureTime2 returns '4' (seconds). If EXIF_ExposureTime is 0.25 then it returns '1/4' (of a second). EXIF_ExposureTime can be set in the following formats: '1/50', '1/50 second', '4', '4 Seconds', etc.