I have been looking at different scopes to see how the field of view is for the same magnification. If a scope shows a larger field of view at the same magnification does that mean I have a bigger picture but it is still going to be the same size image at that magnification. I am not sure I am asking the right question. The bigger fov would seem to be a better thing if the magnified image is the same. Help me out. Thanks.
Rifle Scopes Field of view vs magnificatio
- Thread starter shootnf
- Start date
10x is 10x, FOV is not directly related to magnification value. It's possible to have 100' FOV at 10x and 150' FOV at 10x. The issue here is peoples perception when the two are side by side. The larger FOV will lead to the illusion that the smaller FOV scope makes thing look 'bigger' than the scope with the larger FOV. This is not true, but it's sometimes hard to convince some people that the magnification level is exactly the same.
As a general rule, it's advantageous to have a larger FOV, but with the exception of movers, it's really not that important.
As a general rule, it's advantageous to have a larger FOV, but with the exception of movers, it's really not that important.
Think of it as one eye open or two. Images are the same size but the view is larger. More FOV at the same magnification is a good thing.
In a larger field if view display, the objects are the same size but you see more of them especially those furthest away from center.
Correct; it is inversely related to eye relief (that is, as eye relief increases, FOV decreases if magnification and ocular lens diameter remain constant).
A crude way to visualize this to punch a small hole in a piece of paper; if the paper is closer to your eye, FOV increases, while moving the paper further away narrows FOV.
FOV is actually calculated from the apparent FOV of the ocular lens, which most riflescope manufactures don't catalog. AFOV / MAG = TFOV. The Telescope focal length / ocular focal length = MAG. Since they don't normally provide the scope's focal length, or the f-stop of the ocular, you'd have to back calculate the values from the listed items, like FOV at 100 yards. Convert that to degrees, then you could get to the AFOV of the ocular, presuming the magnification value was correct, and in most cases it's been rounded off by some odd amount. Eyepieces can be designed with long eye relief, but this will normally result in a larger diameter lens to achieve the same field. High magnification, large field and long eye relief = expensive.
