11-10-2016, 07:01 AM
Well, take a balloon with some text on it and stretch it. What happens to the text ? It gets bigger. Translated to lenses this means that the pixel are "stretched". Of course, pixels are discrete so their state is stretched into neighboring pixels causing a decrease in resolution.
If you take an image at 105mm (at 6000x4000px), the left/right center loss accumulates to about 400px that have to be interpolated/stretched.
Note: I'm not sure whether this is a 'linear' loss or whether the relative loss increases the more you move to the borders. If it is not linear the interpolation effort rises accordingly (more blur).
Well, the Zeiss lens is wider. Personally I'm not a lover of that 18mm setting (vs 16mm). But as a package I would prefer the Sony G lens.
If you take an image at 105mm (at 6000x4000px), the left/right center loss accumulates to about 400px that have to be interpolated/stretched.
Note: I'm not sure whether this is a 'linear' loss or whether the relative loss increases the more you move to the borders. If it is not linear the interpolation effort rises accordingly (more blur).
Well, the Zeiss lens is wider. Personally I'm not a lover of that 18mm setting (vs 16mm). But as a package I would prefer the Sony G lens.