Great for shooting 0..25" (6mm and smaller) sized subjects. The mount thread is M67 and the outer diameter is 61 mm on the front, this will provide you the best strobe position when the lens is at the minimum focusing distance.
Aluminum body (6082)
Hard anodized coated 40 microns
Two flat glass BK7 with anti scratch and anti-glare
3 groups of 2-element lens