It’s physically impossible for a scope to be perfect at its extremities because when
Vignetting only occurs at the extreme adjustments of the optic’s available travel (both in windage and elevation) due to the fact that the erector assembly is positioned at an extreme up/down/left/right position.
When the erector assembly is in this extreme position, there may be a visible obstruction of the light-ray-trace pattern. The extreme positioning allows the edges of the focusing tube to slightly obstruct the light-ray-trace which will cause a ‘shadow’ or ‘crescent moon shape’ to form in the field of view.
When you run
In order to avoid vignetting from a manufacturing
(Words: U.S. Optics)
To do away with the vignetting saga, a brand new (and much more reliable alternative to ‘frequently-moving-the-reticle-of-your-scope-around’) mounting system has been manufactured:
Minute of Angle Base/
When installed on your rifle the M.O.A.B./M.R.A.B allows the shooter to compensate for the trajectory drop of their bullets in a mechanical way rather than optically. By doing so it eliminates unnecessary wear inside the scope; it provides you with a greater range of adjustability; and reduces the occurrence of VIGNETTING!
The M.O.A.B/M.R.A.B system is used in conjunction with a normal
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