http://www.opticstalk.com/hensoldt-diatal-8x52-zeroing_topic43076.htmlAfter mounting a riflescope on a firearm, the gunsmith zeroes the riflescope for a specific range, i.e. the line of sight is aligned with the bore axis of the barrel in such a way that the point of impact and the aiming point coincide at a specific distance.
As the trajectory is curved, the bore axis and the line of sight form an angle which is dependent on the type of ammunition used and the range. At longer or shorter ranges than the sighting-in distance or when the line of sight is not horizontal (in the mountains), the shooter will aim above or below his target to compensate for the difference in distance.
If a riflescope is correctly mounted on a firearm, it is generally not necessary to readjust the line of sight relative to the weapon. If a re-adjustment is necessary for special reasons or if a riflescope/firearm combination is to be zeroed for a new range, proceed as follows:
1. Unscrew the protective cap (1).
2. Only loosen the bright, chrome-plated screw (2).
Do not loosen the three dark, painted screws (3)!)
3. Using the knurled disc (4), you can now adjust the reticle as required.
To correct a high shot, turn the disk (4) counterclockwise.
To correct a low shot, turn the disk (4) clockwise.
4. Re-tighten the bright screw (2); do not use force, otherwise the fine thread of the elevation adjustment will be damaged.
5. Check the point of impact. If necessary, repeat the procedure as described until the result obtained is satisfactory.
6. Loosen the three painted screws (3).
Turn the graduated ring (5) until its index line is opposite the marking (6). This index allows you to make adjustments of a defined magnitude during sighting in. In addition, this index enables you to find the zero position again if, in special cases, the adjustment was changed. The index can also be used to indicate the reticle adjustments for other ranges and types of ammunition after additional markings for these ranges and types of ammunition have been provided.
7. Re-tighten the three screws (3).
8. Screw the protective cap (1) back on. Take care not to squash the rubber gasket (7)!.
OK. OK, I changed weapon to firearm to prevent someone lecturing
