It is the width of the front (objective) lens in millimeters. A 50 mm objective is just that- 50mm, or just under 2 inches, across.
Adjustable Objective
Magnification, Distance, Objective size, etc..
50mm at least.I have found that with a 50mm objective you will need a minimum of high scope rings.Most medium hight scope rings will not give you the clearance needed for a 50mm scope objective.
32mm objective, 4 power magnification.
3 to 9 is the magnification available & 40 is the objective diameter in millimeters. The "objective" is the glass lens farthest away from your eye when mounted on the rifle.
3 to 9 magnification with a 50mm objective lens
It magnifies 4 times, and the objective (front lens) is 40 mm in diameter. A 3x9-40 would be a 3 to 9 power variable magnification scope, with a 40mm objective lens.
scope is why to do and objective is how to do
The objective of a project is the goal or purpose it aims to achieve, while the scope defines the boundaries and deliverables of the project. In simpler terms, the objective is what you want to accomplish, and the scope is what will be included in the project to achieve that objective.
The BSA Sweet 17 rifle scope is an affordable scope that's designed for beginning rifle users. Average prices on the scope range from $50.00 to $100.00 in most cases.
It's all about the optics. When you are looking for a scope you need to look at what you are using it for. The magnification and objective lens size will be the main things to look at. For example you would not want a standard 4 X scope if you plan on hunting varmints or shooting 700 yards at a target. You would want to go with a higher power and a larger objective lens. There are many things to understand when looking for a scope and this is just one thing.
For a Bushnell Buckhorn 3-9x40 rifle scope, you'll typically need a scope cover that fits a 40mm objective lens. Look for a cover labeled for 40mm scopes, which should provide a snug fit. Brands like Butler Creek or Vortex offer universal scope covers that can accommodate this size. Always check the product specifications to ensure compatibility.