Convert your SQ-Ai body to an aperture-priority, auto exposure camera, instantly! Just attach the TTL reading AE Prism Finder S and concentrate on the bright, laterally correct, upright image in the viewfinder rather than worrying about f-stops and shutter speeds. With a halfway stroke of the shutter release, the LED display indicates the correct shutter speed for existing subject brightness. Voila! FEATURES INCLUDE: ASA range 25-6400 Shutter speeds 8-1/500 second Switchable between Auto AE and Manual modes