The horizontal reticle indicators will help in adjustment for wind conditions.
For example, a particular file using a cartridge with x grains bullet weight, y amount of powder and z type and brand of powder, will have a bullet drop of two inches at 300 yards, eight inches at 600 yards, etc. The amount of hold over or under will be determined by your rifle, ammo, angle of fire, etc. The reticle will only tell you the distance to the target. Your adjustment of the scope to address the distance will now depend on the rifle, ammo, etc. If he covers half a reticle interval, he is around 2y meters away, etc. If you sight a standing person whom you estimate is about x meters tall and he occupies one reticle interval in your scope sight, it means he is y meters away. Depending on the standard used (US Army or US Marines), one reticle interval is equilavent to around x meters height at y meters distance. The rangefinder reticle is for target range estimation. The crosshairs could disappear in the shadows. Do you have an illuminated reticle? This is very useflul when shooting a target with a dark or cluttered background like shooting a bird up a leafy and shady tree. Other hunting scopes for reasons of economy and reliability have fixed objectives (usually, 4x yata). IIRC this also adjusts the scope's parallax (parallax: something like the clearest focus vis-a-vis a given distance yata). It simply means you can adjust the objective lens' magnification from 6 to 24 times. AO means adjustable objective, as opposed to fixed objective. It will gather a lot of light and will result in very clear scope images, but is bigger and heavier. That is a big objective lens you have there. The 50 is the diameter of the objective (front) lens in millimeters. 6-24 is the magnification range so you can adjust magnification between 6 to 24 times normal.
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