VueScan normally previews or scans a single frame at a time. If you want to do multiple frames at a time, use the "Input|Batch scan" option.
There are two types of scanners that can do batch scanning: scanners that can randomly address individual images (like movable film holders or a flatbed set up for multiple frames in a grid) and scanners that can eject the current image and insert the next image (like the Nikon SF-200 slide feeder or the Epson Automatic Document Feeder). Both types of scanners can do batch scanning with the "Input|Batch scan" option.
You can significantly speed up batch scanning on some scanners by setting two options so the preview won't be done when you do a scan. To do this, set the cropping for all the frames, then clear "Crop|Auto position". In addition, if the "Input|Lock exposure" option is displayed, turn it on and set "Input|RGB exposure" to either "1" or a value greater than one that won't overexpose any of the images.
You can batch scan multiple photos, slides or film strips on a flatbed scanner if you lay them out in a rectangular grid and use the following procedure:
If you're using the Epson 2450/3200 negative film holder, use the following values:
If you're using the Epson 2450/3200 slide holder, use the following values: