Before you go any further, if you need a reflex red dot sight, look no further than our tube style one right here: 

The objective lens of a scope is the lens located at the front of the scope, closest to the target. It is responsible for gathering light and forming an image of the target. The size and quality of the objective lens can affect the overall performance of the scope, particularly in low light conditions.

The ocular lens is the lens located at the rear of the scope, closest to the shooter's eye. It is responsible for magnifying the image formed by the objective lens and for focusing the image so that it appears clearly to the shooter. The ocular lens is typically adjustable, allowing the shooter to fine-tune the focus of the image to their individual vision. The size and quality of the ocular lens can also affect the overall performance of the scope.

In summary, the objective and ocular lenses are important components of a scope that work together to form a clear and accurate image of the target for the shooter. The size and quality of these lenses can affect the performance of the scope and are important considerations when choosing a scope.