Lens Construction: 5 elements, 3 groups
Compatible Camera (Up To) Sensor Size: 36mm x 24mm (135mm Full Frame)
Camera Lens: 60mm-105mm
Diopter(Underwater Focal Length): +23 (43.48mm)
Working Distance: 27mm-36mm (from front of lens)
Max Magnification: x4.2 (Area Ratio x17.64) with 105mm F2.8 macro lens
Glass/Coating: Optical glass/multi layer BBAR coating
Lens Barrel: Aluminum w/ type II anodizing
Mounting Thread: 67mm
Dimensions: ~71.7×60.3mm
Weight (air): 593g
Weight (water): 379g
Depth Rating: 197ft (60m)