To a lesser degree, vignetting also occurs with APS-H sensor sizes, such as several ( now discontinued ) cameras of the 1D series.
32.
Nevertheless, the lens center is sharp even wide open, though the corners are soft . There is a fair amount of vignetting, wide open.
33.
With a flat image plane, 90?is the widest field of view that can be captured in focus and without significant wide-angle distortion or vignetting.
34.
The exit pupil widths in rifle sights are designed to be larger than the eye's pupil, to allow for a range of motion without vignetting.
35.
Any device similar to a teleconvertor designed to use the primary lens for wider angles than those for which it is designed is therefore likely to cause vignetting.
36.
Unless this is just lens Vignetting we are seeing glare from the snow that would indeed be filtered from view by these or similar that have Polaroid lenses.
37.
:For what it's worth, even at 400 pixels wide, you can see at least one major optical flaw : the Vignetting is terrible.
38.
Personally, none of the SLR lenses I've owned have ever had vignetting this bad; I'd probably return the lens if it did.
39.
Exceptional sharpness, minimal vignetting, very low distortion, and superb handling of chromatic aberration means this lens does not require image corrections in digital post production software.
40.
The lens is designed specifically for use with APS-C sized image sensors, and thus will result in vignetting on 35 mm ( full frame ) cameras.
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