... Meade Instruments Corporation . ... Meade Pictor XT-Series CCD Autoguider/Imagers . Section 7: Camera Menu . ... allows the user to take continuous exposures using the current exposure setup. ... Exposure Time: The Pictor cameras can take exposures as short as 4ms or as long as 120min, though a practical limit on exposures time will usually be less than 20 minutes for most objects and conditions. ... The camera will then take the rest of the images and add them together to produce a single image. ...