The Optisan CP 3-12x32P Riflescope has a compact 10" length and is intended for small, lightweight rifles. With a 32mm objective lens, this scope is capable of minimizing the effects of parallax error, ensuring that it experiences very small shifts in impact as you change your head position or distance to target. You can leave the parallax fixed and shoot targets at different distances without experiencing a shift in point of impact. This capability is very helpful in competition shooting.