LEE Filters Foundation Kit MK1 100mm Lens Filter Holder MK1
WHAT CONDITION THE CONDITION IS IN: 88-Day Confirmed Operation Warranty. Cosmetically in excellent shape and with its original soft pouch. Adapter ring sold separately. Scroll down to read its story. Or skip it and just look at the picture (yes only one). We won't judge. Much.
The LEE Filters Foundation Kit MK1 held its ground at the top of the landscape photography world for over twenty-five years before the LEE100 arrived in 2019 to relieve it of duty.
The holder is built from a high-impact glass-filled nylon composite and brass with the no-nonsense conviction of something designed to survive both a Scottish hillside and a photographer's impatience, it holds two to four 100mm filters. It rotates a full 360 degrees for precise alignment and slims to a single slot when wide-angle lenses demand humility. It announces each filter's secure placement with a spring-loaded brass pin that clicks with the satisfying finality of a well-made argument.
Of course, it has its quirks. That same pin has a mischievous habit of popping loose at inopportune moments. Slot adjustments require a screwdriver (because apparently the MK1 believes preparation is a virtue), and light leaks will find you if you're careless, which is the filter holder's way of insisting you pay attention.
And yet photographers who've used both will tell you, with the quiet certainty of people who've earned their opinion, that they still reach for the MK1. They do so not in spite of its demands, but because a tool that requires something of you tends to give something back.
Technical Specifications
System Standard: 100mm (4-inch) system
Filter Dimensions Supported: 100 × 100 mm, 100 × 125 mm, and 100 × 150 mm rectangular/square filters (resin and optical glass)
Standard Filter Thickness: 2.0 mm (compatible with 1.0 mm and 4.0 mm filters using optional accessory side guides)
Slot Capacity: Modular assembly; 2 slots pre-installed out of the box, customizable to 1, 2, 3, or 4 slots via modular guide blades and varying brass screw lengths
Mounting Mechanism: Quick-release spring-loaded solid brass pull-pin latch
Rotation: Full 360° continuous rotation independent of the lens mount for horizon and graduated line alignment
Adapter Ring Compatibility: LEE Standard & Wide-Angle Adapter Rings from 49 mm to 105 mm (including 49, 52, 55, 58, 62, 67, 72, 77, 82, 86, 93, 95, 105 mm threads). Bayonet adapter rings (Hasselblad Bay 50, Bay 60, Bay 70, and Rollei VI/VII)
Front Expansion Compatibility: Accepts the optional LEE 105 mm Front Accessory Ring (for 105 mm circular/landscape polarizers) and LEE Tandem Adapters (for stacking two independent rotating holders)
Materials & Construction: High-impact glass-filled nylon composite frame, solid brass fasteners, and tempered spring steel internal retention
Country of Origin: Made in the United Kingdom (LEE Filters, Andover, Hampshire)

