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The disadvantage of the front sight of the objective lens is that it is not easy to protect. For example, when it is dropped, the objective lens is definitely the first to touch the ground first.
Moreover, the sealing of the focus of the general front objective lens is not very good, it is easy to enter water, and when the objective lens is used, it must be moved back and forth, and the internal nitrogen will easily leak. And sometimes once the fixture is loose, it will aggravate the error during focusing.
Then the objective lens located on the side has the advantage that it belongs to an internal adjustment method. All components are built-in, which will not cause collision problems like the front one. Moreover, when the focus is adjusted, the parts of the scope are in Its internal movement avoids the problem of nitrogen leakage.
The disadvantage is that when processing parts and assembling, the side objective lens has very high requirements for the manufacturing accuracy and installation technology of the parts. Because once an error occurs, the installed scope is useless.
From the perspective of the scope of use, we ordinary civilians use a lot of front objective lenses. Side-adjusted objective lenses are mostly used in the equipment of military police and law enforcement units, and they use more.
Because the equipment used by military police and law enforcement units generally requires actual combat, the front objective lens must be adjusted with the hand extended, and to see the value on the objective lens circle, you need to stand up and look at it. The whole equipment is lifted up and viewed, so it will directly expose its position, so it is not suitable for military and police use.
When the side-adjustment objective lens is in use, the user only needs to tilt his head slightly to see the above value, and the hand does not have to stretch out too much.
The above are some introductions about the difference between the front objective lens and the side objective lens in the scope monopoly. I hope it will be helpful to everyone.