Originally posted by aggiegolfer09
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Optical vignetting is caused by light hitting the lens aperture at a strong angle - an internal physical obstruction. This effect is often noticed in images taken with wide angle and wide aperture lenses used with wide open apertures. The strongest light angles will be found at the image edges.
Bigger tubes usually mean less light obstruction and therefore more perceived brightness. Not always but sometimes depending on quality of the optics glass. I guess that's why my old Leupold 1" tube x 40mm objective scopes seem brighter and clearer to me than these big 30 and 34mm Chinese scopes.
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