Character： ·High resolution level is featured by using the adjustment screw P=0.25 ·Lockable adjustment screw ·Using retainng ring to hold optics ·High quality steel spring for increased stiffness and stability and smooth feel

specifications model 7MM0620 7MM06254 A(optic diameter)(mm) 20 25.4 B 18 23 weight(kg) 0.1 0.1