The LEE Filters 100mm System Foundation Kit is the entry point into LEE's modular 100mm filter system, giving you the holder, adaptor ring, and everything needed to start stacking square and rectangular filters on your lenses.
What's in the kit
The Foundation Kit typically includes the 100mm filter holder, a LEE standard adaptor ring to match your lens thread, and a foam light seal — though the exact contents are shown on the individual listing. The holder accepts 100mm-wide filters, the industry-standard size for serious landscape and long-exposure work. Adaptor rings are available in common lens thread sizes including 52mm, 58mm, 67mm, 72mm, 77mm, and 82mm, so you can match the holder to most lenses in your kit.
What you can do with it
If you shoot landscapes, seascapes, or architecture and want to use graduated ND filters or solid ND filters without resorting to circular screw-in options, this system is the go-to starting point. It works with a huge range of adaptors, so one holder serves across multiple lenses in your bag. Pair it with LEE's own Big Stopper or Little Stopper ND filters, or grad ND sets, and you've got a complete controlled-exposure toolkit.
Who is it for
This kit suits any photographer moving from screw-in filters to a proper slot-based system. Whether you're just starting out with grad NDs or building a multi-filter landscape kit, the Foundation holder is the foundation everything else clips onto. Because it's a fully mechanical accessory with no electronics, a pre-owned kit in good shape works exactly like a new one — making it a genuinely smart buy second-hand.
