Stretch factor 1.33X
Coverage 45 MM
Focus throw 100 0
minimum focus 3'6.7"1M
filter threads 77 MM
Weight 0.8lbs 380g
size 2"5CM
get in on B&H
Readily available. V1 has a screw for alignment lock, V2, shipped as of late-2015 is locked through a reverse ring at the rear.