The Nikon SF-200 Bulk 35mm 50 Slide Feeder is a specialized accessory designed for use with Coolscan 5000 and 4000 scanners. This feeder allows users to easily scan multiple 35mm slides at once, making the scanning process more efficient and convenient. With the Nikon brand reputation for quality and precision, the SF-200 ensures reliable performance for photo and slide scanning needs.  This is a specialized piece of gear, so know what you are buying.