The Uncoated Rear Element Set for Cooke miniS4/i Lens from ZGC includes six elements for the Cooke 18, 25, 32, 50, 75, and 100mm miniS4/i lenses. These elements can be swapped with the standard coated elements by a qualified lens technician. Uncoated rear elements may help create a different, historic look such as more flare, softer edges, etc.
For those who want softer contrast, more flaring, and an older lens look and feel.