The Macro Port 94 has been designed for the Canon 100mm f 2.8L IS USM lens with image stabilization for macro-photography.
Flat port diameter: standard 67mm thread for close up lenses
Depth rating: 100m
Construction: Hard anodised aluminum alloy
Glass material: optical BK-7 65mm diameter, 8mm thick
Macro Port 94
Plastic snap in 67mm port cap.