I will second the motion for Vortex check the website at vortexoptics.com Several choices of reticle, power and objective dia. I compared the viper to a ziess conquest on a side by side rig at my LGS. I purchased the viper. they were equally clear and bright. The viper is a 4-12x40 the conquest was a 3-9x40. I chose the viper because it had a parallax adjustment knob, for the same price.