In this very short video I explain the difference between first focal plane and second focal plane scopes. These scopes are the Sig Sauer Tango4 and Vortex Viper PST. Click here to check them out on Amazon: http://amzn.to/2o12Fy8 (Tango4) http://amzn.to/2oqrwa8 (Vortex)
