Very useful bit of kit! I use this when working straight from cds, where the images are too large to copy across to the network and you can’t preview the images properly. Be aware that if the original files are big or there is a huge amount of images in the source folder; it may take a long time for photoshop to complete this process, but it does save time in the long run by enabling you to go straight to the file you want to use. The process is unlimited; if you set the contact sheet to display 20 photos on a page and you have 25 photos, it will automatically keep going, creating a second sheet with the extra 5 photos. Make sure that you get all the initial settings right as once it is set into motion it is difficult to stop the process without force quitting.