The Optika5 2-10x42 scope comes in two versions: one with side-mounted adjustable parallax (PA) and one without. Both versions feature MeoBright lens coatings, which allow for maximum light transmission, and MeoDrop hydrophobic coating, which repels water. The non-PA version has a fixed parallax, set to be parallax-free at 100 yards. On the other hand, the PA version allows for fine-tuned focus at any range, with side-mounted adjustable parallax from 10 yards to infinity. This means that the user can adjust the scope to focus on targets that are closer or further away, depending on their needs. Overall, the Optika5 2-10x42 is a versatile scope that can be adjusted to suit a range of shooting situations.