KRL-05S +13 "Lucky 13"

Lens Construction: 4 elements, 3 groups
Compatible Camera (Up To): Sensor Size: 36x24 (135mm Full Frame)
Camera Lens: 60mm-105mm
Diopter: +13 (76.92mm)
Working Distance: 60mm-85mm (from front of lens) 
Max Magnification: x2.5 (area ration x6.25) 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: ~71.7x42.4mm 
Weight (air): 410g 
Weight (water): 280g 
Depth Rating: 197ft (60m)
The below images were all shot with the KRL-05 +13 "Lucky 13" Diopter by Mike Bartick at Crystal Blue Resort in Anilao.