March Scopes Canada - Calgary

With a First Focal Plane scope, the reticle size changes as you turn the magnification up or down. Therefore the reticle always covers the same percentage of the target; in MOA or MILS. When you increase the magnification, the target appears larger and so do the lines of the reticle. This also applies to the distance between any vertical or horizontal hash marks. 

Generally First Focal Plane reticles are thicker than Second Focal Plane reticles when at maximum magnification. They need to be so that you can still see the reticle line at minimum magnification; as the reticle line gets thinner as you reduce the magnification. Any elevation and windage hash marks also get physically closer together as you view them in the scope however on the target the distance between the  hash marks consistently covers the same MOA or Mils on the target.   

Therefore the advantage of a FFP scope is that if your hash marks  are one MOA or one MIL apart on the target at any magnification. Whereas a SFP scope the hash marks are only one MOA or one MIL apart  on the target at one designated magnification.  

** NOTE **

Some Reticles may appear to be the same. However often the dot is twice the size and the line thickness of the cross hair is twice as thick on the illuminated models.